: You can check your status by going to Settings > General > About > Carrier Lock . If it says "No SIM restrictions," your iPhone is already unlocked. Third-Party Software Tools
If a carrier refuses an unlock request, certain software tools claim to bypass these restrictions. simunlocker-unlock-iphone-sim-card-worldwide-tool
: You must contact your current provider and request an unlock. Once approved, the carrier sends a "server unlock" signal to Apple. : You can check your status by going