My phone is not activating

Sorry, I don't know what else to offer you for trying to resolve this. If you have a local Apple Store or authorized Apple repair center near you, you can try working with them to see if they can help. Good luck!

Also, the following articles might offer some help:

• Find My iPhone Activation Lock - Apple Support
• Turn off Find My iPhone Activation Lock - Apple Support

If you can't activate your iPhone - Apple Support

Then have your cousin review this article so that you can activate the phone:

What to do before selling or giving away your iPhone, iPad, or iPod Touch - Apple Support

Did you buy this phone new directly from Apple or used from a third-party?

When you try to activate your phone, do you have it connected to a computer and use iTunes or are you just performing an "over the air" update? If the latter, try updating using iTunes instead.