My parents bought 2 Sony t62u phones from Cingular long ago.Then my father wouldn't use his.Said it was too complicated.I got a phone off E-bay and used his SIM so we'd not waste $$$ on the acct.I went to the local AT&T Store(Corporate) last night and explained to them I had a 5 year old SIM and that I needed to get a newer one(old one was 32k).Also told her that my Go Phone SIM(3g) did better on recption in the same phone(Razr).She set me up with a new AT&T 3g SIM for free.Now this may not work for everyone.They may charge you $25,or try to.But go to a Corporate Store,not a reseller.Tell them if nothing else,that customer service told you over the phone it could be done for free.At least this way,if you desire to upgrade to a 3g phone later,you have a proper SIM for it.Also,I have a sneaking feeling that AT&T would like to get everyone to newer 64k 3g SIMs anyhow.Just my opinion,YMMV 