unlocking ques

[mj0528]

Say I want the possibility of using my now at&t iphone with T-mobile but would like to pull the sim and use it with at&t or t-mobile at will. Would I install the activated custom firmware and build my iphone with my apps and then be able to come and go from at&t to t-mobile at will or is it once I install the activated firmware, I have to stay with the unofficial carrier? I would like the possibility of using it with another carrier but staying mostly at at&t. Is this possible? Will I screw things up if I use the activated firmware with the t-mobile sim when I put my at&t sim in?

Thanks as always!

[neodude237]

If you are on iPhone 3.1.3, chances are you can't unlock now.

[mj0528]

Sorry, I shouldve specified. I'm on 3.1.2 with 5.11.07 with old bootrom

[Cer0]

If you unlock you can come and go between ATT and Tmobile slightly easy. It will disrupte your apps or sync'd info.

[mj0528]

How should I go about it? Stick the t mobile sim in and use the activated custom firmware and rebuild apps or ? I used an unactivated custom firmware the last time I restored.

When you say disrupte? What will happen?

[neodude237]

Just run blackra1n? You could also use redsn0w if you're sure its the old bootrom.

[mj0528]

Even if I'm already jb on custom firmware?

[neodude237]

Gotcha. Blackra1n would probably do it, but for the sake of being safe, just stick an AT&T sim and activate it first? Then use cydia and get blacksn0w.

[mj0528]

So, use blacksn0w with the already unactivated firmware with the AT&T sim in the phone. I won't need to start over with s different firmware?

Thanks!!

[neodude237]

You will if you are on 3.1.3, if so, downgrade to 3.1.2 and then blackra1n it.

[mj0528]

Blackra1n? I'm already jb! I'm confused! I have a 3gs 3.1.2 with 5.11.07 on a unactivated firmware.

Can you use blacksn0w on a custom firmware? I guess blacksn0w is the only option on 5.11.07, right?

[neodude237]

Sorry, you're device plus firmware thing said you were on 3.1.3. Do you not have an AT&T sim to activate the phone with? If it is jailbroken already like you said, just activate it again and get blacksn0w.

[mj0528]

Oh, you're right. I had one on 3.1.3 then I traded for an old bootrom 3.1.2. My iPhone is currently with AT&T and I have a work phone with a tmobile sim card. I'd like to trade them back and forth whenever I wanted.

Thanks for your help!'

[neodude237]

But you said the phone is unactivated, but it is jailbroken? If its a USA phone, just put the AT&T sim in and activate it and go to Cydia, then get blackra1n.

[mj0528]

Yes, jailbroken with a unactivated ipsw for use with AT&T. So, just get blacksn0w from cydia and I can then swap sim cards out at any time between my AT&T personal phone and my tmobile work phone at any time? Sorry I haven't given thanks. I will when I come back and reply on my pc.

Thanks!

No one?

[mavrik101]

The only app that should be affected is sms/mms. Different ipcc files. Other than that, if you are unlocked, you can switch sims at any time with no issues.

[neodude237]

Yes, jailbroken with a unactivated ipsw for use with AT&T. So, just get blacksn0w from cydia and I can then swap sim cards out at any time between my AT&T personal phone and my tmobile work phone at any time? Sorry I haven't given thanks. I will when I come back and reply on my pc.

Thanks!

No one?

Exactly that. Just activate with the AT&T sim first so you can get to the home screen obviously

[mj0528]

Thanks guys! now I'm debating using blacksn0w. Seems like a lot of people have issues with it. No?

Thanks again!

[neodude237]

If you are on the 5.11 baseband, you HAVE to use blacksn0w.