I know at&t has sims cards but that is the only service provider that i know of that has sims cards. I tried us cellular,t mobile, verizon,sprint... is there other service providers that use sims cards besides at&t?

I know the T-Mobile uses SIM cards because I've used the same SIM card in four different phones.

Whether or not your SIM card is compatible across networks could be a whole nother issue. I googled around a bit a couldn't find anything that looked as if it might help you. This article might help a little:

http://www.ehow.com/about_6547727_ce...atibility.html

Most US providers run a proprietary business model and don't cooperate all that much.

they told me they dont use sims cards (tmobile)

I'm guessing they meant that they don't accept other carriers' SIM cards.

I found this link about their SIM cards. It indicates that theirs do not work with other carriers without special actions. The reverse is likely true.

http://support.t-mobile.com/doc/tm51...revPageIndex=3

U. S. carriers commonly expect you to buy your phone from them and use their SIM cards. The European model of getting a SIM card from the carrier and buying the phones separately doesn't apply here. Maybe it should, but it doesn't.

You don't mention why this is an issue for you. If you are visiting the US and want cell service, your best bet is probably to get a "disposable" prepaid phone.

If you would tell us more about what exactly you are trying to accomplish, we might be able to help more effectively.

ok My friend bought the nokia n900. We both live in the u.s. Well anyway he doesnt have internet and right now he teathers off his phone to use the internet. Were we live is (BFE) we cant get cable only satelite internet, hughes net. The only problem with that is its more expensive than cable. So he teathers off of his phone which is an htc amigio well he wants to use linux but cant update so we tried vzacess manager which comes from verizon to teather installed that on wine 1.2 and that didnt work either so i figured get a phone with linux on it and teather off of that. Thats when i found the nokia n900. From what i read and heard its supposed to be the most powerful handheld computer that fits in your pocket. So thats my problem i cant find a service provider that does sims cards I know at@t does it but then again we live in bfe! the funny thing is, is that i called almost everbody and the main corp said they do use sims card but we would have to go to a store to get one. Well we did that and they told us they dont use sims cards so talk about a headache? I think thats the whole story to it. thank you