Would my AT&T SIM card work with a Sony Ericsson Z520a or Z525a?

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JulieV

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I have used my sim card in 3 different AT&T phones, but when my son got one of those new phones (blackberry style) his didn't work. Just try it, you'll know if it works if you can call your # and the new phone rings, if it doesn't, then you need a new sim card which is free
 
The Sony Ericsson Z520a and Z525a both have the Cingular logo on them. I understand that Cingular became AT&T once again, but is there any sort of glitch that would prevent me from using my new AT&T SIM card in these phones, or would I be in the clear? Thanks!
 
I have used my sim card in 3 different AT&T phones, but when my son got one of those new phones (blackberry style) his didn't work. Just try it, you'll know if it works if you can call your # and the new phone rings, if it doesn't, then you need a new sim card which is free
 
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