iPhone 4 fw: 4.3.5 bb: 04.10.01 - Gevey Sim options?

so friend sold me at&t iphone 4, have t-mobile guess option have use gevey sim, have questions...

- gevey sim ultra best choice t-mobile?

- reliable place can buy gevey sim from?

- iphone has firmware 4.3.5 installed.. can jailbreak , preserve baseband? (my baseband 4.10.01) should care preserving baseband? i'm asking because wonder if in future unlock might released works 4.10.01 , not newer ones.

- can upgrade latest firmware 5.0.1 without upgrading or modifying baseband? have "shsh blob save" thing?

- able activate phone gevey sim? i'm afraid once itunes ask me "activate" have no account at&t.

can please enlighten me? i've read many guides questions haven't seen definite answer for. appreciate help.

 

come on please help?

 

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