T-Mobile is one of the most litigated telecommunications companies in California. Data breach class actions, consumer fraud claims, billing disputes, and record subpoenas keep T-Mobile in front of California courts on a near-constant basis. The 2021 breach alone — one of the largest in the company’s history — generated hundreds of class actions filed across the country. If you need to serve T-Mobile, the registered agent is in Sacramento and the process is straightforward, but you need the right entity name.
The Correct Legal Entity
The correct entity for most California litigation is T-Mobile USA, Inc. T-Mobile USA, Inc. is a Delaware corporation and the primary operating entity for T-Mobile’s wireless services in the United States. The parent company is T-Deutsche Telekom AG’s T-Mobile US, Inc. (the publicly traded holding company), but that is not the entity you serve for most California lawsuits involving wireless service, billing, or data practices.
T-Mobile acquired Sprint Corporation in April 2020. If your case involves legacy Sprint accounts, Sprint contracts, or conduct that predates the merger, the correct defendant may be Sprint LLC (formerly Sprint Communications Company L.P.) or another Sprint-era entity. Verify the correct entity against your facts before serving.
Search bizfileonline.sos.ca.gov to confirm the current registered agent before serving. Large telecom companies with recent merger histories can have multiple entities with changing agent designations.
Where to Serve
Registered agent: CSC Lawyers Incorporating Service
Address: 2710 Gateway Oaks Dr, Suite 150N, Sacramento, CA 95833
CSC is the designated registered agent for T-Mobile USA, Inc. in California. Their Sacramento office is in the South Natomas corridor, off the Garden Highway near the Sacramento Executive Airport. Surface parking is available in front of the building, and the suite is on the ground floor with direct access — no building security checkpoint.
CSC accepts service of process Monday through Friday, 8:00 AM to 2:00 PM. The 2:00 PM cutoff is the critical scheduling detail at this location. Services attempted after 2:00 PM will not be accepted. Plan accordingly, particularly for Rush and same-day service orders.
For more on serving at CSC’s Sacramento office, see our CSC service page.
What Documents Are Commonly Served
T-Mobile’s litigation exposure in California covers several distinct categories:
• Data breach class action complaints — The August 2021 T-Mobile data breach exposed the personal information of approximately 100 million customers, including Social Security numbers, driver’s license data, IMEI numbers, and account PINs. T-Mobile agreed to a \$350 million settlement in that case, but individual and class action filings related to the breach and subsequent incidents continue to be filed in California courts.
• Consumer fraud and false advertising complaints — Claims involving unauthorized plan changes, deceptive promotional pricing, improper early termination fees, and “bill shock” from undisclosed charges.
• Billing dispute complaints — Individual consumer protection actions under the Consumer Legal Remedies Act (CLRA) and the Unfair Competition Law (UCL) for billing errors, double-charging, and refusal to honor promotional credits.
• Subpoenas duces tecum for call and text records — Attorneys in criminal defense, personal injury, family law, and employment cases frequently subpoena T-Mobile for call logs, text message metadata, location data, and account records. These subpoenas are served on the registered agent.
• CCPA-related complaints — California Consumer Privacy Act claims arising from the company’s data practices, breach notification timing, and data minimization obligations.
How We Handle It
CSC at 2710 Gateway Oaks Drive is one of our highest-volume service locations. We serve there multiple times per week for T-Mobile and dozens of other major corporations that designate CSC as their California registered agent. We know the building, the intake desk procedures, and the documentation requirements.
The most important operational detail for T-Mobile service is the 2:00 PM window. We schedule CSC services to ensure delivery well within that window, and for Rush orders we confirm availability before accepting the assignment.
Service Level | Timeframe | Price
Standard | 10 business days | \$99
Expedited | 3 business days | \$150
Rush | 24 hours | \$175
Court Filing Add-on | — | +\$30
