SIM and eSIM Guide
Understand physical SIMs, eSIM profiles, transfers, PINs, PUKs and common service errors.
SIM and eSIM credentials connect a cellular plan to compatible hardware. Transfer and activation rules depend on both carrier and phone model.
Start with the safest checks
Use observation and reversible tests before changing settings. Write down the exact message, recent changes and conditions that reproduce the problem.
- Identify physical SIM versus eSIM
- Confirm carrier and model support
- Keep the old line active until transfer completes
- Obtain PUK codes only from the carrier
- Do not erase a profile without a recovery plan
Protect your data and accounts
Back up important information before repair, reset, sale or transfer. Never disclose passwords, one-time codes or full device identifiers in public.
- Verify backup completion
- Use official account-recovery channels
- Keep sensitive identifiers out of screenshots and URLs
Know when to stop
Stop when a phone is swollen, smoking, leaking, physically damaged or extremely hot. Manufacturer, carrier or qualified repair support is appropriate when safe checks do not isolate the fault.
- Do not puncture or open a battery
- Do not use heat, freezing or conductive tools
- Ask about warranty, data handling and cost before repair
Related help
Sources and editorial responsibility
This original GetMyUnlock resource is maintained under the editorial policy. Product menus and carrier requirements can change; verify important steps with the current official source.