Unlock/JB iPhone 3G 4.2.1 BB 05.15.04 help

[martymvpturco]

I just bought an iPhone 3G 4.2.1 FW with 05.15.04 BB on craigslist (previously had a 2G iPhone and unlocking/jailbreaking that was a breeze)

I need to unlock the phone to use it on T-Mobile

What is the best way to jailbreak/unlock my phone so that it is untethered?

I was going to use greenpois0n until I read somewhere that the phone can't be unlocked afterwards?

I've done a lot of research on the net but I just wanted to get some clarification before I used redsn0w or greenpois0n and did any irreversible damage

If I have to upgrade to BB 6.15.0 it wouldn't be the end of the world.. I just really don't want my phone to be tethered!

Some help would be great!

[ESI]

This guide made it easiest for me..

iClarified - iPhone - How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

You can also check out this thread....

Basic Questions Iphone 3G 4.2.1 w/ 5.15.04 BB

.... as I probably asked many of the same questions you are thinking of...


EQ

[martymvpturco]

Thanks ESl.. your links did help, but I still don't know if that method of jailbreaking is tethered or untethered

[iYeow]

The jailbreak will be untethered jailbreak, but once you have installed ipad baseband, if you ever need to restore to 4.2.1 again, it has to be a custom firmware not stock 4.2.1 anymore as there is a baseband check which cannot be kicked out by irecovery from TU.

[martymvpturco]

The jailbreak will be untethered jailbreak, but once you have installed ipad baseband, if you ever need to restore to 4.2.1 again, it has to be a custom firmware not stock 4.2.1 anymore as there is a baseband check which cannot be kicked out by irecovery from TU.

Okay good. The battery life on this 3G isn't the greatest. If I had to plug it in the computer everytime it died to jailbreak it again then that would be a pain!

I'm going to jailbreak with redsn0w tonight and unlock with ultrasn0w

[iYeow]

Ok, good. Let us know

[martymvpturco]

Ok, good. Let us know

Well, the Jailbreak went fine but now after I unlocked with ultrasn0w, my phone won't get any service using my T-Mobile simcard.

I've tried uninstalling and reinstalling with no success. I even used a different ultrasn0w from cydia.heaveniphone.com and have had no luck.

I've been searching for solutions for the past 2 hrs with no luck.

Please help!

[AAred]

did you use the 6.15.00 baseband?

[iYeow]

+1, go check your baseband, if your bb is 05.15 , then you have to update to ipad bb.

And you know that you have to turn off 3g to get service for T-mobile.

[martymvpturco]

did you use the 6.15.00 baseband?

+1, go check your baseband, if your bb is 05.15 , then you have to update to ipad bb.

And you know that you have to turn off 3g to get service for T-mobile.

Yeah its the 6.15 iPad BB. 3G is turned off. I have reset my network settings several times, airplane mode, etc but it won't work!

I got it to work for about 10 minutes, then I rebooted my phone and it went back to "No Service"

It's so frustrating!

Is there a fix for ulrrasn0w?