Many users have faced this problem of not being able to sign-in to use iMessage, sometimes it pops-up saying that it is network error (though mobile is working perfectly with all the other applications or features available in the iPhone) and sometimes it says that the e-mail cannot be verified as is already being used somewhere else.
We will be providing you the correct method to activate iMessage service and moreover a probable solution to the problems mentioned above. Follow the steps mentioned below to activate ‘iMessage’ on your iPhone:-
Go to Settings and then tap ‘Message’ option, toggle the iMessage switch to ON, iPhone will ask you to pay charges to the carrier for switching ON this service.
Then tap the ‘Receive at’ Section and then enter your mobile number, for iPhone your mobile number is always preferred, as most of the contacts in your phone list will know you by your mobile number rather than apple ID. Even if you want to add your Apple ID then go ahead but in the Call ID section choose your phone number as the caller ID.
Now a problem may appear stating that Apple ID cannot be verified as the e-mail is already in use. Now as per solution searched on internet, they say that it is advisable that a common apple ID should not be used among multiple apple devices. So, make sure that apple ID is not being used anywhere else on other Apple devices and you will get rid of this error message.
You might face any other stating that the phone number is being verified and that verification ends, for this issue you can reset all the network settings and then restart your iPhone most of the times this has solves this problems.
If any of the problem still persists after performing the steps mentioned above then you will have to go to the Date and Time settings and change that to automatic this also might get rid of you these, though this solution might seem awkward to you but actually this worked for many users.
Please let us know if the problem still persists even after following these steps, put your problem in the comments section.