How to check if iphone is unlocked?

3 Quick Ways to Check iPhone Lock Status1.Check iOS Settings Menu:Method 1 (Fastest).Go to Settings > General > About. Scroll to Carrier Lock. If it says No SIM restrictions, your iPhone is fully unlocked. If it lists a specific carrier name or says SIM locked, it is restricted to that network.2.Test with a Different Carrier's SIM / eSIM:Method 2 (Definitive).Power off your iPhone, insert a SIM card (or activate an eSIM) from a different network provider, and turn it on. If you can make a call or browse cellular data without a "SIM Not Supported" error, the device is unlocked.3.Contact Your Network Carrier:Method 3 (Network Check).Find your IMEI number under Settings > General > About, then call your network carrier or log into your account portal to verify if your device contract is fulfilled and unlocked.Comparison of Checking MethodsChecking MethodSpeedAccuracyRequires Second SIM?Works Offline?iOS Settings (Built-in)Under 10 Seconds99% ReliableNoYesDifferent Carrier SIM Test1–2 Minutes100% ReliableYesNo (requires signal)Carrier Customer Care5–15 Minutes100% ReliableNoNo (requires connection)Online IMEI CheckersVariableUnreliable / RiskNoNoWhat Different Carrier Lock Statuses MeanNo SIM restrictions: The iPhone is factory unlocked or carrier unlocked and can be used on any network globally.SIM locked / [Carrier Name]: The device is restricted to a single network provider until unlocking eligibility requirements (contract completion or full payment) are met.