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Unlock 4.2.1 - Pay as You Go

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prnoct90

macrumors regular
Original poster
Dec 11, 2007
120
0
I have an iPhone that I use on Softbank in Japan. I come home for a couple weeks each year, and would love to use a pay as you go plan. I have jailbroken my iPhone 3GS running 4.2.1 and then unlocked it. I then got a sim card from AT&T for a pay as you go plan, when I put it in the phone it just searches for a long time and then says No Service. Is there anything I could be doing wrong. I never put this sim in any other phone.
 
prnoct90 said:
I have an iPhone that I use on Softbank in Japan. I come home for a couple weeks each year, and would love to use a pay as you go plan. I have jailbroken my iPhone 3GS running 4.2.1 and then unlocked it. I then got a sim card from AT&T for a pay as you go plan, when I put it in the phone it just searches for a long time and then says No Service. Is there anything I could be doing wrong. I never put this sim in any other phone.
Click to expand...

If the softbank phone unlocked? Do they lock phones in Japan? If it says no service it most probably is locked. Check the SIM on another phone if its working.

http://wirelesswatch.jp/2010/07/16/softbank-mobile-iphone-stays-locked/

According to that its locked.

Check your baseband and google to see if it can be unlocked. And go from there..
 
prnoct90 said:
It was locked, but like I said in my post, I unlocked it.
Click to expand...

Right missed that. Few things could be happening:

1. Have you verified the "unlocked" status of the phone before?

2. How did you unlock? Did you do it right?

3. Have you verified your SIM is working correctly? Try it on someone else's phone.

4. Go under settings > carrier > it should be automatic with a tick... let it run for a while do u see any other options.. can you select anything else.. if you see ATT and you can select it does it make a diff?

Could be any of the above. Try and see what happens.
 
jdaniel said:
Right missed that. Few things could be happening:

1. Have you verified the "unlocked" status of the phone before?

2. How did you unlock? Did you do it right?

3. Have you verified your SIM is working correctly? Try it on someone else's phone.

4. Go under settings > carrier > it should be automatic with a tick... let it run for a while do u see any other options.. can you select anything else.. if you see ATT and you can select it does it make a diff?

Could be any of the above. Try and see what happens.
Click to expand...

How do I verify the unlock status. I installed Ultrasnow and assumed that worked. The SIM works in other phones. For some reason, when I put this sim in, there is no carrier section on the main settings screen.
 
prnoct90 said:
How do I verify the unlock status. I installed Ultrasnow and assumed that worked. The SIM works in other phones. For some reason, when I put this sim in, there is no carrier section on the main settings screen.
Click to expand...

Well if the SIM works in other phones..unless ATT is doing something special.. I doubt its the problem with the SIM..

So..troubleshooting..umm I would guess its something to do with the unlock..
I havent had to unlock recently so I am not familiar.. my latest phone is factory unlocked.

But I assume.. you read from somewhere that your baseband is unlockable? Whats your baseband
 
maybe the SIM is locked?
also, if you had it in another phone before the iPhone I believe the prepaid sim card will only work w/ that phone for the first 3 months or something like that if there was any credit on the sim card.
 
Carlanga said:
maybe the SIM is locked?
also, if you had it in another phone before the iPhone I believe the prepaid sim card will only work w/ that phone for the first 3 months or something like that if there was any credit on the sim card.
Click to expand...

if the sim is locked it would ask for a password.. and on the 2nd part thats new never heard of that one before..
 
The fact that you ran ultrasn0w does not mean that your phone is necessarily unlocked. Since you are running 4.2.1 unless you have been saving an unlockable baseband by using pwnage tool to update to custom firmware. It is likely that you have an unlockable baseband.

Anything higher than 5.13 cannot be unlocked.
 
nebo1ss said:
The fact that you ran ultrasn0w does not mean that your phone is necessarily unlocked. Since you are running 4.2.1 unless you have been saving an unlockable baseband by using pwnage tool to update to custom firmware. It is likely that you have an unlockable baseband.

Anything higher than 5.13 cannot be unlocked.
Click to expand...

Is there a way to bring my baseband back down? It is currently 05.15.04 . Doesn't Cydia automatically backup your old basebands?
 
I think that's what I'll end up doing, because I am planning on getting a new iphone when they are released this summer anyways.
 
prnoct90 said:
I think that's what I'll end up doing, because I am planning on getting a new iphone when they are released this summer anyways.
Click to expand...

Yeah if you follow the instructions and all that you should be fine. I talked a friend of mine thru it back in Canada and no problems :) Gd luck.
 
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