iPhone 3gs on Tmob with data?

[evasivenotraKcs]

Okay, I finally gave in to the iphone when I found out you could put em on prepay t-mobile, now after a bunch of reading my question is What is the ideal setup?
I want to have data, and dont mind paying the extra $10 or whatever a month, and ideally I want unlimited errrr thing.
Do I just pick up a prepaid sim pack from the tmob store or do I need something else?
And what is the best plan to setup?
I've been searching a bunch to try and figure this out, I understand I'm going to have to unlock it, which I have access to an ATT activated sim from an phone already, and I think I have to revert to an older iOS (phone is on 4) to do that?
Thanks in advance, I appreciate all you smart kids on this site alot.

[adp]

You cannot get the $10 data plan on prepaid. All data plans require a postpaid voice plan. The minimum voice plan is $29.99. If you want data on prepaid your only option is by getting the sidekick data plan, but you will need to access a proxy and some sites require payment.

[evasivenotraKcs]

So that means I could use one of the no-contract plans then too? If I went that route what is the best way to do so? (I ask because I see and have been reading about the phone specific data plans, do I need to get one for a specific phone?)
is this the best way to go?

[adp]

If you want unlimited everything, then that's absolutely the best way to go. Voice, data & text will work on the iPhone

[dazzer1983]

Use o2 £10 a month unlimited Internet 300 texts plus £10 credit. Or £15 with o2 calls free as well.

[evasivenotraKcs]

I am in the not so united states, O2 is for the UK right?
And thanks again adp. Now can ya just tell me how to go from box to t-mobile on a 3gs running iOS 4?

[dazzer1983]

Yes o2 is uk. Have T mobile in uk also. Didn't know us had T mobile.

[adp]

I am in the not so united states, O2 is for the UK right?
And thanks again adp. Now can ya just tell me how to go from box to t-mobile on a 3gs running iOS 4?

Wait, we're talking about T-mobile USA here, correct? I'm not at all familiar with O2 or T-mobile UK...the plans you posted on your earlier post were from T-mobile USA

[evasivenotraKcs]

Yeah sorry my play on our country not being united as one made that confusing. I am in the USA.

If I can "slide to unlock" does that mean I'm ready to drop in a tmobile sim or do I have to wait for a new jailbreak to drop for me to unlock this phone for tmobile?

[adp]

When you "slide to unlock" do you see an app called "Cydia?"

[evasivenotraKcs]

NO. the prev owner has confirmed it was jb on 3.1.2 tho

[adp]

Well try putting your SIM card in. It can't hurt.

[evasivenotraKcs]

Lol I don't have a tmobile sim yet because I didn't want to start a plan and have it unusable and be paying money. Why don't you have ALL the answers? ;-)

[adp]

Well if you're on 3.1.2 you have nothing to worry about as it is fully unlocked for the 3GS. Double check by going to Settings - General - About - Version #

[evasivenotraKcs]

I wish bro. Phone is on Fu(ked point oh. Guess I join the ranks of those sitting dead and waiting.

[adp]

What?? As long as you're not on 4.0 you're fine

[evasivenotraKcs]

I am on the 4.0. That's the problem. The prev owner had it on a jb 3.1.2 And updated to 4 and wiped it when he sold it. Unfortunate, guess I'll find a tmobile sim to drop in and try.

[adp]

If you have the old bootrom there's hope for you. Otherwise, you'll have to wait until the next jailbreak is released which will probably be when 4.0.1 is released