SIM Card not support

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.

To be able to use any SIM across the globe you must have "No SIM Restriction" against Network Provider Lock. Please refer to the pic below.

You will have to contact the carrier it’s locked to.

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

That’s because the phone is carrier locked to a cellular provider other than the one you are trying to use. ONLY the carrier it is locked to can unlock it for use on other carriers. The article I linked to explains the process of unlocking the device, but the carrier it’s locked to MUST do the work on the back end to unlock it. If they refuse, it can’t be unlocked. There is nothing you or Apple can do about it. The carrier “owns” the lock. Apple does not have the legal right to unlock the device. Only the carrier it’s locked to does.

YOU can’t. Only the carrier it is locked to can do that. Contact the carrier it is locked to.

If you don’t know who that is, ask whoever you got the phone from.