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BreachRecord

T-Mobile USA Data Breach (August 2021): What Was Exposed and What To Do

Last updated Oct 20, 2026 · Based on 2 official filings · See sources

According to the notice filed with the Washington State Attorney General on Aug 24, 2021, T-Mobile USA reported a data breach. It was also reported to the California Attorney General. People affected: At least 2,079,648 people in 1 state (Washington residents, Washington State Attorney General filing).

Key facts

From 2 official filings
Organization
T-Mobile USA
Source: Washington State Attorney General, filed Aug 24, 2021
People affected
At least 2,079,648
At least 2,079,648 people in 1 state (Washington residents, Washington State Attorney General filing)
Source: Washington AG, Aug 24, 2021
Incident dates
Jul 22, 2021
Source: Washington State Attorney General, filed Aug 24, 2021
Source: California Attorney General, filed Aug 25, 2021
Discovered Aug 17, 2021
Source: Washington State Attorney General, filed Aug 24, 2021
Notice dates
First filed Aug 24, 2021; latest filing Aug 25, 2021
Source: Washington State Attorney General, filed Aug 24, 2021
Information exposed
  • Social Security number
  • Driver's license
  • Date of birth
  • Name
Source: Washington AG, Aug 24, 2021
Filed with
Free credit monitoring
No offer is stated in the filings we have. Check your letter.

What to do now

Steps chosen from the information listed in the official filings. Your own letter may list more.

  1. A credit freeze stops new credit accounts being opened in your name. It is free by law and you can lift it when you need credit: Equifax, Experian and TransUnion.

  2. An IP PIN stops someone else filing a tax return with your Social Security number. Get one from the IRS at irs.gov.

  3. Ask your state's DMV what it recommends when a driver's license number has been exposed. Find your state's agency at USA.gov.

  4. Scammers often contact people after a breach, pretending to be the organization, a bank or a government agency. Do not give your Social Security number, passwords or codes to anyone who contacts you first.

  5. You can get free credit reports from all three bureaus at AnnualCreditReport.com, the official site.

  6. The Federal Trade Commission's IdentityTheft.gov gives you a personal recovery plan.

Is the letter real?

The agency published an official copy of the notice. Compare your letter with it:

Letters usually list a phone number for questions. Before calling, check that it matches the number in the official copy linked above.

Never give your Social Security number, bank details or passwords to someone who contacts you first.

Timeline

  1. Incident began (earliest date reported) source
  2. Organization discovered the incident source
  3. Reported to Washington AG source
  4. Reported to California AG source

Sources

  1. Washington State Attorney General Notice filed Aug 24, 2021
    Filed as “T-Mobile USA” · 2,079,648 Washington residents · Official copy of the letter
    The link opens the Attorney General's list of notices.
  2. California Attorney General Notice filed Aug 25, 2021
    Filed as “T-Mobile USA”

Last updated Oct 20, 2026. Our summaries are written in our own words from the official filings above. Spotted an error? Report a correction.