Swapping SIM cards?

[Axisman]

Hi everyone,
I'm new here and I have a question. I just upgraded to an iphone from a blackberry. The problem is that my wife is not eligible for an upgrade yet and her blackberry is not working properly (trac-ball broke). I can get an iphone from a friend cheap. The question is, if i get the iphone for my wife and jailbreak/unlock it would i just be able to put her SIM card in and be ready to go? Secondly, I jailbroke my iphone 3g, would i jailbreak /unlock the new(used) phone the same way (other than different software versions)? Thanks in advance for all of your help!!

[Europa]

You don't need to jailbreak and unlock it if you're already with AT&T. But if you're with T-Mobile, that should work fine. Just have her switch from the BB to the iPhone data plan if you have AT&T. There are a few different programs for jailbreaking and unlocking.
http://blog.iphone-dev.org/

[Axisman]

But if I would unlock/jailbreak the phone I wouldn't have to notify at&t and the iphone would work fine? If it does work could I then cancel the blackberry data plan and just use the wifi for my data? Just looking to save a few bucks!! Thanks again!

[theiphonemaster]

There are a couple ways to go about this.

1) BB SIM will work on iPhone running 3.1 beta 2. So upgrade and have your UDID added to a dev server. IF you have a jailbreak iphone do not do this as there is no jailbreak yet for 3.1

2) If you go with the AT&T iPhone plan there is absolutly no difference between the $30 and the $45 data plans except the cost. No matter what AT&T tells you will not work. It does.

If you need help with the 3.1 or UDID dev activation email wynndc@yahoo.com. This dude is cool and will walk you through MMS settings as well. Thanks.