Advanced users can re-flash the baseband firmware. While this can fix "No Service" errors caused by corrupted software, it cannot change the whitelist of allowed carriers stored on Apple’s servers.
For users with carrier-locked phones that are running outdated iOS versions (and wishing to preserve their ability to use unlocking services or RSIMs), accidentally updating iOS can be disastrous. 3uTools can disable the OTA (Over-The-Air) update badge and notifications
While many users seek an "exclusive" way to carrier unlock an iPhone using 3uTools, it is important to clarify that 3uTools is primarily a management tool for flashing firmware, jailbreaking, and checking device status.
Before attempting an unlock, you must use 3uTools to verify your device’s current state.
to see if the device's IMEI is authorized to use a specific ICCID (SIM card). Apple Support 3uTools Capability:
: Connect your iPhone to 3uTools. The IMEI will be displayed prominently on the information screen. You can click to copy it. Check Carrier Lock : Navigate to the Flash & JB tab and look for the "Verification Report" or use the 3uTools Carrier Check tool to see which network the phone is tied to (e.g., AT&T, , Verizon) Confirm SIM Status : On the device, go to Settings > General > About > Carrier Lock
Even the iCloud bypass comes with massive drawbacks: