After resetting iMessage still not able to sign in

Follow these detailed steps , and you can remove phone number from iMessage.
1. Remove phone number from iMessage on iPhone
Step 1: Make sure your SIM card is in your iPhone. And turn on your Iphone, then open Settings.
Step 2: Tap Messages.
Step 3: Tap "Send & Receive".
Step 4: Turn iMessage off.




Of course, if you no longer have the iPhone, or maybe you drop it to your bath tub and it's no longer functioning, this is not an option, which means you'll have to go another route.
2. Remove phone number from iMessage online with Apple's "Deregister iMessage" service
Step 1. Go to Apple's dedicated "Deregister iMessage" service. By the way, you can enter into the Apple website to seek for the "Deregister iMessage" service.

Step 2. If you no longer own the device, find the "No longer have your iPhone?" menu. Enter the phone number you'd like to de-activate from iMessage and click Send Code.

Step 2. Check your current phone for a text message and enter the code that you're sent. Wait for a bit and you should get a confirmation that your phone number has been deregistered.

For more details, check: How to Remove Phone Number from iMessage?

You can try Leawo iTransfer to complete this task. Just follow the below steps.

Step 1. Connect you iPhone to computer and open Leawo iTransfer. Then it will detect your iPhone and you need to click your iPhone and you will see the library on the left bar. Select SMS option.

Step 2. All the messages will appear and choose the iMessages you want to delete and right-click the selected files and choose Delete.

After deleting the iMessages on Leawo iTransfer, users will find all the iMessages on iPhone have been deleted permanently.
It is so easy to delete iMessage on iPhone with Leawo iTransfer, isn't it? Besides deleting iMessages on iPhone, Leawo iTransfer could also help you to manage 12 kinds of files from iPhone to computer which can safeguard your files in an effective way.

For more details, check: How to Delete iMessage on iPhone

oh no come on its so simple to log into google go to your web browser type google in that web search Enter your Google Account username and password. If a username is already filled in and you need to sign in to a different account, click Sign in with a different account. If you see a page describing G mail instead of the sign-in page, click Sign in in the top right corner of the page. follwow this will help you https://accounts.google.com/SignUp
Google

When logging in press forgotten password option and follow instructions!

Hard reset, Press the volume up and power button for about 10-15 seconds to reboot. Wipe data/Factory reset.

If you can log on to your Facebook account, click the down-pointing triangle in the upper-right, click "Settings," then click the "Edit" to the right of the "Password" line. If you can't log on, click the "Forgot your password?" on the Facebook sign-in page.

First manually delete all imessages and messages on your phone. This wil not get back all the space but it ensures you have no messages and the success rate is much higher.

If you can't remember the PIN/Password then you may have to do an external data reset. Ensure you are connected to WiFi to ensure it isn't just an issue because you aren't connected to the internet before resetting. Then go to Motorola Support Find Answers Motorola Mobility Inc to locate your device and find external reset instructions.

Mark
Motorola Support

She can Reset her password

1. Follow the steps to recover your account. You'll be asked some questions to confirm it's your account and an email will be sent to you. If you don't get an email:
   • Check your Spam or Bulk Mail folders
   • Add [email protected] to your address book.
   • To request another email, follow the steps to recover your account .
   • Check all email addresses you might've used to sign up or sign in to your account.

Account support

Peggy,

There are a few things we can try:

First, make sure iMessage is enabled by going to Settings, then Messages. The toggle should be set to "On". If it is "Off", when you switch it on it should ask you to sign in with your AppleID.

Also, make sure the contact of the person(s) you are trying to use iMessage with includes the email address they are sending iMessages from. It will not work with phone numbers.

I hope this helps!

Mike