Prepaid minutes on iPhone 3G?

[Ragnes]

I just received an iPhone 3G. (My brother has purchased two updates since he had this one.) I like the idea of having an iPhone but I don't want to be paying $40 or more each month to use it. Does anyone know if there is a way to prepay
and then only pay for the minutes you use. For example, I'm told that with T-Mobile, you can buy 1000 minutes for $100 and you have one year to use them.
If you know of something like this for iPhone 3G, would you please let me know.
Thanks,
Ragnes

[Giaguara]

Where are you?
Different countries offer different pre-pay options. In US I've used AT&T go&pay since 2009. $25 added will last for 90 days, and unused will carry over as long as I charge again within 90 days. I only bought the go&pay card, and it's been used with iPhone first gen, then 3, 3G, and now 4. Most of the places I go to have wireless anyway, or with anyone having a 4S, they can share the internet connection. All those phones have worked just fine with AT&T.

[Ragnes]

Thanks so much, Giaguara. I had looked myself and then started asking people and had basically given up on the idea of using this phone. I need to wait a couple days to check this out, but I'm excited about being able to use the phone.
Ragnes