i forgeten id password my is activation

Not sure what lock you're attempting to say the issue is, but my guess is:

Activation Lock:

You must have access to the Apple ID that is locked on the device. The device might display the Apple ID as 'e*****@gmail.com' which is a reference to the Apple ID locked on to the (it is not accurate to it length for security and privacy reasons). If you don't have the Apple ID access then you must contact Apple Support or an Apple Store with a proof of owner to unlock the device, but you'll won't be able to ever use the Apple ID again (which includes backups).

Also see my Original Answer.

If it is none of the above and you mean the information has changed on your Apple ID you may have been victim to a phishing scheme see:

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

If you think your Apple ID has been compromised - Apple Support

If your seeing the words 'Activation Lock' and the device belonged to another person ask them to remove it from there iCloud account under 'Find iPhone'. If they cannot remove it from their account ask for a proof of owner or see about a refund if possible.

If your not seeing 'Activation Lock' I do notice the words 'No Service' if this is the issue then it might be a simple activation issue. Please see the following articles:

Turn off Find My iPhone Activation Lock - Apple Support

https://support.apple.com/en-ca/HT201407

If you try everything in the provided articles. You may not be able to use the device. Call Apple Support to confirm.