Ok. First off, Yes, if you buy an Unlocked phone through EBay it will work with your Sim card.
1 think to look for in the Unlocked Phone:
The Frequency used. You will be looking for the following:
850 / 1900 Mhz.
850mhz is Very Important Especially with AT&T.
Once you found a phone you like that Has the 850mhz band, the other features of the phone is up to you.
The only thing to look for is the 850mhz. I would also verify that the phone has the 850band by googling that phone model. Just to see if the specs are right.
Once you get your unlocked phone, pop out the battery and insert your sim card into the new phone and power it on. Assuming you saved your contacts to the sim card it will show up on the new phone.
Hope this helps.
if you do get a new phone, and need help with it, come back. Or you can email me. Just click my user name.
I'm really confused about my cell phone situation. I'm trying very hard to keep an old plan that I got through AT&T. My cell phone isn't operating too well these days so I would like to get an new one. If I buy an unlocked cell phone on ebay will it be operational with the merged AT&T/Cingular company? Are there certain features in the phone that should be looking to make it compatible? What's the deal with my SIM card? Can I still use it in a new phone? I'm really not savvy in this area. Dumb down the answer as best you can. Thanks.