I want to unlock my phone

If you see No Service or Searching on your iPhone or iPad

1. Check your coverage area. Make sure that you're in an area with cellular network coverage. ... 
2. Restart your iPhone or iPad. Restart your device. ... 
3. Check for a Carrier Settings update. ... 
4. Take out the SIM card. ... 
5. Reset your Network Settings. ... 
6. Update your iPhone or iPad. ... 
7. Contact your carrier. ... 
8. Get more help.

If you see No Service or Searching on your iPhone or iPad ...

Remove your SIM card from the SIM card tray and then put the SIM card back. ... Make sure that the SIM tray closes completely and isn't loose. If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly.

If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad ...

Learn what to do if you see a SIM not supported alert.

Okay, we’re not Apple. We’re other users.

We can’t unlock a carrier-locked iPhone, which is what this appears to be.

You have a carrier-locked iPhone. Your SIM is not associated with that carrier. You or (if this is a recent purchase) the seller will have to discuss clearing that lock with the carrier holding the lock.

Only the carrier can clear the lock, and not all carriers will permit the lock to be cleared.

For details ➡️ How to unlock your iPhone for use with a different carrier - Apple Support

Your phone is carrier locked. You need to contact the carrier to request that they unlock it. Start here: https://support.apple.com/en-us/HT201328