Changing Blackberry Phone on AT&T

A friend of mine has an really old Blackberry on the AT&T network for personal use.  His work gave him a less-old Blackberry (I think the Curve) to keep as they gave him an iPhone for work.  He wants to stop using the really old Blackberry and use the less-old Blackberry for his personal use.  What does he need to do to get this done?  Can he just move his SIM card from old the old blackberry to the less-old?  Does he need to call AT&T with the EMEI number of the less-old blackberry to activate it on that network?  Thank you.
amigan_99Network EngineerAsked:
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I found this link I looks to meet what you are trying to do.

Good Luck!
Sorry here is the link.

AT&T Link
Lee W, MVPTechnology and Business Process AdvisorCommented:
AT&T's network is not Verizon's - you don't need to call them up and give them IMEI and other numbers.  

PROVIDED the SIM card is the same size and the service capabilities (both can do LTE or 3G), you can just change the SIM card.

If you want to be safe, bring the old phone to AT&T and tell them you want to use it, they should be able to change the SIM Card for you if necessary ensure the services match the phone.

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