I just bought a N900 off ebay earlier today. I intend for this to replace my N770(which is awesome, even though its a bit slow), and my aging $20 TracFone(pay-as-you-go) cellphone(Note: I am in the US).

Now that I have my new device bought, I need to find a cellular provider.
I'm a very light phone user; somewhere around 30-60 minutes/month. This may change in the future however, so I want to find a solution that won't lock me into just a few minutes a month or something.
SMS wise, I have never yet -sent- a SMS, but I would like to be able to -receive- them.
Data wise, I have never had a Smartphone, especially not one with the features of the N900, so I don't know what my use will be. I know that with my N770, I do use wi-fi a lot, though being able to do light browsing almost anywhere(even slowly) would be -very- nice.
Now, as far as providers go, I think I'm looking for a prepaid or pay-as-you go solution; I don't really want to be locked into a contract, unless I find a -really- good option.

Do you guys know of some compatible providers? I've heard a lot about Tmobile on this forum, but I'm not sure how I'd go about getting a sim from them and hooking it up to my phone.

Thanks,

-Rob

Edit: Stupid me forgot to mention that I am in the US.