To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

Phone suddenly showing "No SIM" or "Invalid SIM"? Don't panic, there are a few quick checks that can get you reconnected fast ...

Use a SIM card to check if your phone is unlocked The most foolproof way to determine if your phone is carrier locked is by trying a SIM card from a carrier that uses a different network.