Q: Iphone 7 is not activing ,telling that sim is not valid

Hi

Follow the steps in the following support articles, as appropriate.

If your iPhone is locked to a different carrier than the one that you want to use, you will need to contact the original carrier to arrange for it to be unlocked (subject to their policy).

• If you can't activate your iPhone - Apple Support
• If you can't connect to a cellular network or cellular data - Apple Support
• How to unlock your iPhone - Apple Support