Thanks for your detailed instructions. I am in the exact scenario which you outlined - I upgraded my iPhone and gave my old one away. My new iPhone works great (with my old SIM) but the person I gave the older phone wants to move to Xfinity Mobile but she's unable to do so as the IMEI is still registered to my account/number. Can you kindly update the IMEI to my new phone and deregister the old one so she can port to Xfinity Mobile?
I am replying to you publicly as I didn't see an option to privately message you.
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