My phone will not activate

What happens when you try to activate it? If you're getting an error message, what does it say?

Hi

If your iPhone has been disabled, follow the instructions here:

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

For help with activating it, follow the steps here:

If you can't activate your iPhone - Apple Support

Is it a new phone or used phone ?

If it is used, where did you get it from ?

It could be: cloud locked, blacklisted MEID, balance owed, or previous owner reported it stolen or lost....