Having trouble activating iPhone 7
I’m struggling to activate my old iPhone 7
What makes you think it won't activate?
Have a look at If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
- Learn what to do if you get an error message that says "No SIM" or "Invalid SIM".
- Check the list on the System Status page. If the box by iOS Device Activation isn't green, try to activate your iPhone or iPad later.
- If asked to enter your password as you activate your iPhone or iPad, enter the password. (A password prompt means that Activation Lock might be enabled in Find My iPhone.)