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Trying out Straight Talk SIM - old ATT number still works?

zoso4534

Lurker
Does this make sense to anyone?

I have a phone on ATT, and decided to give ST a try. I'm giving it a go for 30 days before I cancel my ATT service. I received the ST SIM yesterday, popped it in my phone, and everything works great. I decided to get a new number through ST.

Oddly enough, when I call my old ATT number, my phone with the new number and ST SIM installed still rings. I didn't expect that to happen. Is this because the the phone's serial # is still registered with ATT?

Not sure how this all works. Just curious. Hope this isn't going to cause any conflicts.
 
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