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Sometimes after a number is ported in to us, your messaging (texting) can continue to show the number we issued you with rather than the number ported in to us.
iPhone / iOS
The culprit for this would be iMessage. iMessage doesn't update to the new number and needs to be done manually.
Can you try the following;
Android
On Android phone the OS will attempt to synchronise your text messages Google messaging (this feature allows you to also view and send Google messages on a PC or tablet (https://messages.google.com/web/authentication)).
To reset the synchronisation: