Assurance Wireless is a Lifeline wireless-service brand operated through Assurance Wireless USA, L.P. and the T-Mobile organization. It provides qualifying consumers with discounted or free Lifeline-supported wireless service on the T-Mobile network, with available plans and benefits varying by location.
This page provides the current Assurance Wireless mailing address, Customer Care phone number, T-Mobile headquarters information, Lifeline application and recertification support, account assistance and complaint-escalation resources.
Important address clarification: Older Assurance Wireless corporate listings identify 12920 SE 38th Street, Bellevue, WA 98006 as the Assurance Wireless headquarters. That is T-Mobile’s corporate headquarters. Assurance Wireless’ current official Contact page instead directs forms and applications to P.O. Box 818, Killeen, TX 76540.
Assurance Wireless Corporate Office and Customer Service
- Brand: Assurance Wireless
- Operating Entity: Assurance Wireless USA, L.P.
- Parent Company: T-Mobile
- Current Assurance Wireless Mailing Address: P.O. Box 818, Killeen, TX 76540
- Assurance Wireless Customer Care: 1-888-321-5880
- Customer Care Hours: Monday-Sunday, 7 a.m.-7 p.m. Central Time
- Customer Care: Assurance Wireless Contact Page
- Help Center: Assurance Wireless Help Center
- Account Login: Assurance Wireless My Account
- Apply for Lifeline: Assurance Wireless Application
- Annual Certification: Assurance Wireless Lifeline Recertification
- Parent Company Headquarters: T-Mobile US, Inc., 12920 SE 38th Street, Bellevue, WA 98006
- T-Mobile Corporate Phone: 425-378-4000
- Official Website: AssuranceWireless.com
Where Is Assurance Wireless Headquarters?
Assurance Wireless does not currently publish a separate walk-in national headquarters address on its consumer Contact page.
Assurance Wireless is part of the T-Mobile organization. T-Mobile’s corporate headquarters is:
T-Mobile US, Inc.
12920 SE 38th Street
Bellevue, WA 98006
USA
This Bellevue address is useful when researching the parent company’s corporate headquarters, but it is not the mailing address Assurance Wireless currently tells customers to use for applications and forms.
Readers searching for Assurance Wireless headquarters, Assurance Wireless corporate office or Assurance Wireless parent company should therefore distinguish between the Assurance Wireless customer operation and the T-Mobile corporate headquarters.
What Is the Assurance Wireless Mailing Address?
Assurance Wireless’ current primary Contact page lists:
Assurance Wireless
P.O. Box 818
Killeen, TX 76540
The company specifically identifies this address for forms and applications.
This is currently the best address to use when searching for the Assurance Wireless mailing address unless a specific form, notice or Assurance representative provides different instructions.
What Happened to the Charleston, Illinois Mailing Address?
Older Assurance Wireless information lists:
Assurance Wireless
P.O. Box 5040
Charleston, IL 61920-9907
That address still appears on at least one Assurance Wireless My Account help page. However, the company’s current main Contact page and current site-wide contact information instead publish the Killeen, Texas P.O. Box.
Because Assurance Wireless’ own website is not completely consistent, customers sending an important application, eligibility form or other document should follow the address printed on the specific current form or notice they received.
This page uses P.O. Box 818, Killeen, TX 76540 as the primary mailing address because it is the address currently displayed on Assurance Wireless’ main Contact page.
Assurance Wireless Customer Relations Mailing Address
Assurance Wireless’ current Terms and Conditions provide a separate address for written Customer Relations correspondence:
T-Mobile Customer Relations
P.O. Box 3780
Albuquerque, NM 87176-7380
This address is different from the Killeen address used for Assurance Wireless forms and applications.
Customers should not assume that every type of correspondence belongs at the same P.O. Box. Follow current Assurance Wireless instructions for the particular application, complaint, notice or dispute involved.
What Is the Assurance Wireless Customer Service Number?
The current Assurance Wireless Customer Care number is:
Current published hours are:
- Monday-Sunday: 7 a.m.-7 p.m. Central Time
Customer Care can help with matters including:
- Lifeline applications
- Application status
- Phone activation
- SIM or eSIM setup
- Account access
- PIN problems
- Service problems
- Plan questions
- Phone-number transfers
- Phone options
- General Assurance Wireless support
Is 1-888-321-5880 the Assurance Wireless Corporate Number?
1-888-321-5880 is best described as the current Assurance Wireless Customer Care number.
Older corporate-office listings sometimes call it the Assurance Wireless headquarters or corporate telephone number. Assurance Wireless itself currently labels it Customer Care.
The parent-company corporate number associated with T-Mobile’s Bellevue headquarters is 425-378-4000.
What Is 1-888-898-4888?
1-888-898-4888 appears in older Assurance Wireless corporate listings, including the previous version of this page.
That number is not currently published on Assurance Wireless’ main Contact page, Help Center contact information or current Terms as the primary Assurance Wireless Customer Care or corporate-office number.
This page therefore no longer recommends 1-888-898-4888 as a current Assurance Wireless contact.
Does Assurance Wireless Have a Customer Service Email?
The older version of this page listed ou*****@***************ss.com.
Assurance Wireless does not currently prominently publish that address as its general customer-service email on the main Contact page or current Help Center resources.
For ordinary support, use 1-888-321-5880, the official Help Center or your Assurance Wireless account.
Who Owns Assurance Wireless?
Assurance Wireless is part of T-Mobile.
The current Assurance Wireless website identifies the operating organization as Assurance Wireless USA, L.P., and Assurance Wireless service operates on the T-Mobile network.
Assurance Wireless became part of T-Mobile through T-Mobile’s 2020 combination with Sprint. The Assurance business had previously operated within Sprint.
For parent-company headquarters information, see the T-Mobile Corporate Office page.
What Is Assurance Wireless?
Assurance Wireless participates in the federal Lifeline program, which helps qualifying low-income consumers reduce the cost of phone or internet service.
Lifeline is supported through the federal Universal Service Fund. Eligibility is determined under federal or applicable state rules rather than solely by Assurance Wireless.
Assurance Wireless services and benefits can vary by state and customer eligibility.
Available options may include:
- Wireless voice service
- Text messaging
- Mobile data
- Mobile hotspot data on qualifying plans
- Bring Your Own Phone
- SIM or eSIM activation
- Low-cost phone options
Customers should check their ZIP code on AssuranceWireless.com because availability and plan benefits can vary by location.
How to Apply for Assurance Wireless
Consumers can begin through the official Assurance Wireless website and check whether Lifeline service is available in their area.
Lifeline eligibility can generally be based on household income or participation in qualifying government-assistance programs.
The federal Lifeline program currently allows eligible consumers to qualify when household income is at or below the applicable program threshold or through qualifying programs such as Medicaid, SNAP and certain other federal assistance programs.
Eligibility rules can vary in states with their own Lifeline administration, so applicants should follow the instructions presented during the application.
Assurance Wireless Application Problems
If an application appears delayed, rejected or incomplete, first determine whether the problem is with Assurance Wireless or with the Lifeline eligibility-verification process.
Keep:
- Application ID
- Application date
- Eligibility or approval notice
- Requests for additional documentation
- Shipping or SIM information
- Previous Customer Care case information
Call Assurance Wireless Customer Care at 1-888-321-5880 for help involving the Assurance application or service.
If the problem specifically involves the federal National Verifier or Lifeline eligibility determination, the USAC Lifeline Support Center may be the more appropriate contact.
Lifeline Support Center Phone Number
The Universal Service Administrative Company, or USAC, administers the federal Lifeline eligibility systems for the FCC.
- Lifeline Support Center: 1-800-234-9473
- Hours: Seven days a week, 9 a.m.-9 p.m. Eastern Time
- Email: Li*************@**ac.org
- Consumer Website: LifelineSupport.org
USAC can assist with federal Lifeline matters such as:
- Application status
- Eligibility documentation
- Annual recertification
- National Verifier accounts
- One-per-household questions
- Finding Lifeline companies serving an area
USAC advises consumers to contact their wireless provider about the actual phone, wireless service or account.
Assurance Wireless Annual Recertification
Lifeline customers must periodically confirm that they remain eligible for the benefit.
For most subscribers using the National Verifier, USAC performs an initial automated eligibility check. If eligibility cannot be confirmed automatically, the subscriber may receive instructions requiring additional recertification.
Assurance Wireless directs most federal Lifeline recertification questions to USAC at 1-800-234-9473.
Some states operate different Lifeline processes, so customers should follow the specific notice they receive.
Use Assurance Wireless Service Every 30 Days
Assurance Wireless warns Lifeline customers that they must use their Lifeline-supported service at least once every 30 days to keep the benefit active.
Qualifying usage includes:
- Making a phone call
- Sending a text message
- Using mobile data while not connected to Wi-Fi
If the service remains unused and the customer does not respond within the applicable notice period, the Lifeline service can be terminated and the customer may need to reapply.
Assurance Wireless Phone Activation Problems
Activation problems can involve a SIM card, eSIM, incompatible device, incorrect account information or service provisioning.
Before calling Customer Care, keep:
- The Assurance Wireless phone number
- The phone model
- SIM or eSIM information
- Activation instructions
- Application approval information
- Any error messages
Do not post the SIM number, IMEI, PIN or complete phone-account information publicly.
Bring Your Own Phone to Assurance Wireless
Assurance Wireless allows qualifying customers to use certain compatible unlocked phones.
Customers can use the company’s compatibility checker with the device IMEI to determine whether a phone may work with Assurance Wireless.
A phone must be unlocked and compatible with the Assurance Wireless/T-Mobile network. Existing Assurance Wireless customers can call 1-888-321-5880 for help moving their number to a compatible device.
How to Escalate an Assurance Wireless Complaint
If Customer Care does not resolve a service, activation or account problem, document the issue before escalating it.
- Start with Assurance Wireless Customer Care: Call 1-888-321-5880.
- Keep records: Save dates, case numbers, application information, activation messages and promised follow-up.
- Request additional review: Ask whether the issue can be escalated when the first representative cannot resolve it.
- Separate service problems from Lifeline eligibility problems: Assurance handles wireless service; USAC may need to handle National Verifier or federal eligibility issues.
- Use written Customer Relations correspondence when appropriate: Current Assurance Terms list T-Mobile Customer Relations, P.O. Box 3780, Albuquerque, NM 87176-7380.
- Use an outside telecom complaint route when appropriate: The FCC accepts complaints involving wireless service, billing, equipment, coverage, number porting, accessibility and other communications issues.
How to File an FCC Complaint About Assurance Wireless
The Federal Communications Commission accepts informal complaints involving telephone and wireless services.
The FCC recommends trying to resolve the issue with the provider first.
- FCC Consumer Complaint Center: File an FCC Complaint
- FCC Consumer Phone: 1-888-225-5322 / 1-888-CALL-FCC
FCC complaint categories can include billing, equipment, coverage, number porting, accessibility and other phone-service concerns.
The FCC process is separate from Assurance Wireless Customer Care and the USAC Lifeline eligibility process.
Assurance Wireless Careers and Human Resources
Assurance Wireless does not prominently publish a separate public Human Resources telephone number for applicants.
Because Assurance Wireless is part of T-Mobile, job seekers should use the official T-Mobile Careers website for current opportunities.
Current Assurance Wireless or T-Mobile employees should use the internal Human Resources, payroll and benefits resources supplied by the company rather than Customer Care.
Assurance Wireless Competitors and Related Corporate Offices
Assurance Wireless competes with other current providers participating in the federal Lifeline program.
Competitors include SafeLink Wireless, TruConnect, Life Wireless, Access Wireless and other Lifeline providers available in particular states.
SafeLink is currently a Verizon Value brand. Customers comparing Lifeline providers may also find the related TracFone Corporate Office page useful because TracFone and SafeLink are part of Verizon’s prepaid/value wireless organization.
Related parent-company page: T-Mobile Corporate Office.
Older lists of Assurance competitors sometimes include Q Link Wireless and Net10. Those should not be used as current Lifeline comparisons without checking present operating status. Q Link has been permanently debarred from the federal Lifeline program, while the Net10 brand has undergone changes under Verizon’s prepaid business.
Assurance Wireless Reviews on CorporateOfficeHeadquarters.com
There are currently three visible reader reviews on this Assurance Wireless CorporateOfficeHeadquarters.com page.
A March 2025 review describes dissatisfaction with Customer Care communication and the reviewer’s interaction with representatives.
A December 2024 review says wireless service initially worked and then stopped. The reviewer describes contacting both Assurance Wireless and T-Mobile and being frustrated that responsibility appeared to be attributed to the other company.
A December 2022 review describes receiving a phone but being unable to activate it, then encountering eligibility-related messaging and difficulty reaching a person for assistance.
These three reviews involve customer-service communication, wireless-service availability, activation and eligibility confusion. Three submissions are too few to establish a reliable overall positive or negative service trend for Assurance Wireless.
Frequently Asked Questions
What is the Assurance Wireless address?
Assurance Wireless’ current main Contact page lists P.O. Box 818, Killeen, TX 76540 for forms and applications.
What is the Assurance Wireless mailing address?
The current primary mailing address published on the Assurance Wireless Contact page is P.O. Box 818, Killeen, TX 76540.
Is P.O. Box 5040 in Charleston, Illinois still an Assurance Wireless address?
That address still appears on an Assurance Wireless My Account help article, but the company’s current main Contact page and site footer publish P.O. Box 818, Killeen, TX 76540. Follow the address on the specific current form or notice you are sending.
Where is Assurance Wireless headquarters?
Assurance Wireless is part of T-Mobile. T-Mobile’s corporate headquarters is at 12920 SE 38th Street, Bellevue, WA 98006. Assurance Wireless itself currently directs customer forms and applications to a Killeen, Texas P.O. Box rather than presenting Bellevue as its customer mailing address.
Is 12920 SE 38th Street the Assurance Wireless corporate office?
12920 SE 38th Street is T-Mobile’s Bellevue headquarters. Assurance Wireless is part of T-Mobile, but that address should not be confused with Assurance Wireless’ current customer mailing address.
What number do I call for Assurance Wireless customer service?
Call 1-888-321-5880.
What are Assurance Wireless customer-service hours?
Current published hours are Monday through Sunday from 7 a.m. to 7 p.m. Central Time.
Is 1-888-321-5880 the Assurance Wireless headquarters number?
Assurance Wireless currently identifies 1-888-321-5880 as Customer Care. It is more accurate to call it the customer-service number than a dedicated headquarters line.
What is the Assurance Wireless corporate phone number?
Assurance Wireless does not currently prominently publish a separate corporate switchboard apart from Customer Care. Its parent company, T-Mobile, lists 425-378-4000 with its Bellevue corporate headquarters.
Who is the parent company of Assurance Wireless?
Assurance Wireless is part of T-Mobile and operates on the T-Mobile network.
What is the Assurance Wireless legal company name?
The current Assurance Wireless website identifies the operating entity as Assurance Wireless USA, L.P.
Does Assurance Wireless have an email address?
A general support email is not prominently published on the current main Contact page. Customers should use 1-888-321-5880 and the official Assurance Wireless Help Center or account resources.
How do I check my Assurance Wireless Lifeline eligibility?
Begin through Assurance Wireless. For National Verifier eligibility questions, contact the Lifeline Support Center at 1-800-234-9473.
How often do I have to use Assurance Wireless service?
Lifeline customers must use qualifying Assurance Wireless service at least once every 30 days to keep the benefit active. A call, text or use of mobile data while not on Wi-Fi can count as usage.
How do I file a complaint against Assurance Wireless?
Start with Customer Care at 1-888-321-5880 and keep case information. If the issue involves federal Lifeline eligibility, contact USAC. An unresolved regulated wireless-service complaint may also be submitted through the FCC Consumer Complaint Center.
What is the FCC phone number for wireless complaints?
The FCC Consumer and Governmental Affairs Bureau can be reached at 1-888-225-5322.
Does Assurance Wireless have an HR phone number?
A dedicated general public Assurance Wireless Human Resources number is not prominently published. Applicants should use T-Mobile Careers, while current employees should use internal HR resources.
Why Trust CorporateOfficeHeadquarters.com?
CorporateOfficeHeadquarters.com publishes corporate addresses, phone numbers, customer-support contacts, complaint-escalation information and firsthand reader reviews. This Assurance Wireless page distinguishes the current Killeen customer mailing address from T-Mobile’s Bellevue headquarters and separates Customer Care from Lifeline eligibility and regulatory complaint resources.
Page Update Note
This Assurance Wireless page was updated on August 19, 2026, to clarify that 12920 SE 38th Street is T-Mobile’s Bellevue headquarters rather than the primary Assurance Wireless customer mailing address, update the main mailing address to P.O. Box 818 in Killeen, Texas, clarify the older Charleston P.O. Box, verify 1-888-321-5880 as Customer Care and add current support hours, remove 1-888-898-4888 and the older ourteam email as verified primary contacts, add the current T-Mobile Customer Relations address from Assurance’s Terms, explain current parent-company ownership, add USAC Lifeline and FCC complaint resources, address current Assurance Wireless address, mailing address, headquarters, parent-company and customer-service search queries, remove the misleading corporate-office image, and summarize the three visible CorporateOfficeHeadquarters.com reviews.
Disclaimer
CorporateOfficeHeadquarters.com is not affiliated with Assurance Wireless, Assurance Wireless USA, L.P., T-Mobile US, Inc., T-Mobile USA, Inc., USAC, the FCC, any Lifeline administrator, phone supplier or wireless retailer. This page is provided for informational, review and complaint purposes and is not legal or benefits advice.
Mailing addresses, telephone numbers, Customer Care hours, Lifeline eligibility rules, plans, state availability, recertification procedures and government contacts can change. Confirm time-sensitive information directly through Assurance Wireless, USAC or the appropriate government agency before mailing eligibility documents or providing sensitive personal information.
Assurance Wireless Complaints, Reviews and Feedback
Have you contacted Assurance Wireless Customer Care, worked through a Lifeline application, dealt with an activation or service problem, contacted USAC or escalated a complaint? Share a firsthand review below. Useful feedback may address application processing, activation, coverage, phone service, Customer Care, recertification, account access or complaint handling.
Describe what happened, approximately when it occurred, which support route you used and how Assurance Wireless responded. Do not publish your phone number, account PIN, Lifeline application ID, Social Security number, Medicaid information, device IMEI, SIM number, home address or other private information.