PLEASE HELP! how do you make an iphone work on tmobile? more details below?

Mrs. Foxx

New member
So, I have a blackberry that I bought off of ebay and have a Tmobile sim card in it. I have unlimited text and I dont know how many minutes. Most importantly, I do not have a data plan. I can use wifi on my phone at hotspots but other than that, no internet. My friend on AT&T recently upgraded to the iphone 4 and wants to sell me her iphone 3gs.

Will it work?
Do i need to jailbreak it or unlock it?
Can i just put it in and use it?
What is the process?
Is it worth it?
 
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