Q: iphone  not accepting password

Greetings paulfrombarry,

Thanks for using the Apple Support Communities!

I understand that after updating your iOS device to iOS 9.3, your current Apple ID and password are not working to activate your device. In some cases, the hint that you see on the Activate iPhone screen may not match your current Apple ID.

We know that this situation can be frustrating, but we’re here to help. To troubleshoot this situation and work towards resolving it, please read over and follow the steps from the following article.

If you can't activate your iPhone, iPad, or iPod touch after installing a software update - Apple Support

Best