A:Answer That is the phone that I had before, and the same carrier. I took my phone home, changed out the SIM and moved forward with no issues. There were a few apps that I had to reload, but other than that no issues. Now, the plan you have with AT&T may dictate whether you will need assistance with activating - I did not, as my plan allows me to bring my own phone, and I had it activated at the time of purchase. Hope this helps.