Prepaid Mobiles

If I buy an AT&T Samsung Blackjack II(created for AT&T), will my unlimited web plan from T-Mobile cell service work by using the Mobile Internet Explorer on the AT&T Samsung Blackjack phone?

I want to get the Samsung Gravity but it’s for T-Mobile and I have AT&T. The phone I wanna get is UNLOCKED, so would it work?

10pts best answer.

I recently just bought an AT&T Pay As You Go Phone and a PrePaid Card so that I can text. But, I’m so confused.

It’s asking me to pick from the Unlimited Talk Option or The Simple Rate Option. All I want is to use my PrePaid card and text with it.
Here is the information:

Unlimted:You get unlimited calling to any wireless customer of AT&T and all other calls are just $0.10 per minute. For each day you use your phone on AT&T’s wireless network, there’s an additional $1.00 access charge.

Simple Rate Option:Each minute costs just $0.25, whether it’s during the day, night, or on the weekend.

Which one is better?
Please help!
Thank you so much!
Which one is better and why?

What is the cheapest deal I can get for a mobile that has internet and music and stuff. A good phone, but with a cheap plan…What is the best I can get at a cheap price ?

Thanks

ok so I have a prepaid phone with at&t on pick your plan. I was wondering if I buy the tilt at full price, then take the sim card out of my prepaid phone and put it in the tilt, if it would work?

then I came to the assumtion, because it is a smartphone, if i would have to buy a smartphone package, i dont even think there is a smartphone package with prepaid phones? :S

I really want this phone will the sim card work if i put it in any at&t phone?

Do I HAVE to buy a smartphone package?

http://www.wireless.att.com/cell-phone-service/cell-phone-details/?device=AT%26T+Tilt+(Refurb)&q_sku=sku1190046

i want one of those phones, but can i but my sim card in one of them??

I have T-mobile right now and was going to buy the Lg Xenon from ebay.com and use my current sim card from my phone now on the Lg Xenon..can i do that???