iPhone Unlock iPhone 4 IOS 5.1.1 baseband 04.12.02

[nister4]

Hello. I bought this used iphone 4 from friend with ios 5.1.1 and baseband 04.12.02, jailbroken with Cydia. This guy used it with Vodafone carrier (Spain) it always worked well, but now I want to use it with another carrier, and the phone seems to be locked. Didin't had a chance yet to try again with his SIM to check if it's a general problem or just mine. On the phone display in the upper corner it's switching from "serching..." to "no service" and so on.
What can I do?

 

[TriJetHero]

Hello. I bought this used iphone 4 from friend with ios 5.1.1 and baseband 04.12.02, jailbroken with Cydia. This guy used it with Vodafone carrier (Spain) it always worked well, but now I want to use it with another carrier, and the phone seems to be locked. Didin't had a chance yet to try again with his SIM to check if it's a general problem or just mine. On the phone display in the upper corner it's switching from "serching..." to "no service" and so on.
What can I do?

That BB cannot be software unlocked or downgraded.

The only options you have is request the carrier to unlock it or purchase an IMEI unlock online from the greymarket, check the IMEI thread on this forum for suitable unlock service

 

[nister4]

That BB cannot be software unlocked or downgraded.

The only options you have is request the carrier to unlock it or purchase an IMEI unlock online from the greymarket, check the IMEI thread on this forum for suitable unlock service

hey, thanks for your fast answer.

the problem is that the carrier refuses to unlock it on the reason that it's still under contract.
I just tried the original (vodafone) carrier sim (wich used to work because it's the same tht my friend used), and now it doesn't work. is it normal? in other words, now no carrier works on the phone, even the original Vodafone.

p.s. could you point me to the IMEI thread, I can't find it

 

[TriJetHero]

https://forums.macrumors.com/threads/1398957/

If your friend got a new SIM his old one will be inactive.

Try a known active vodafone sim

 

[dhlizard]

https://forums.macrumors.com/threads/1398957/

If your friend got a new SIM his old one will be inactive.

Try a known active vodafone sim

If the phone was sold by Vodaphone, any Vodaphone sim, active or inactive will activate it.

 

[nister4]

https://forums.macrumors.com/threads/1398957/

If your friend got a new SIM his old one will be inactive.

Try a known active vodafone sim

thanks for the link!
the SIM is active, it's the same one he used in the phone before selling it to me.

 

[TriJetHero]

If the phone was sold by Vodaphone, any Vodaphone sim, active or inactive will activate it.

Activate yes, if the som is in active it will not function as phone though

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thanks for the link!
the SIM is active, it's the same one he used in the phone before selling it to me.

It should work when put back in then

 

[iAmFree]

I updated my iOS to 7.0.3 and upgraded the baseband to 4.12.09 so it was just an iPod. Then I downgraded to iOS 5.1.1 and jailbreaked, installed the SAMPref and unactivated (the original network was Hutchison UK) through the normal method. It doesn't unlock but wait, this surprised me!!!

Installed iTunes 11.1.3.8 latest and downloaded ipsw 7.0.4. Put the phone into pwndDFU and restored the 7.0.4 stock via iTunes. After the restore iTunes prompted me something I'd never seen before, "a carrier update is available...do you want to apply the update...?" or something similar. I applied the update and VOILA!!!! I'm now using my SIM after one month of 'no service' thinking if it's worth paying $90 for the unlock

 

[TriJetHero]

I updated my iOS to 7.0.3 and upgraded the baseband to 4.12.09 so it was just an iPod. Then I downgraded to iOS 5.1.1 and jailbreaked, installed the SAMPref and unactivated (the original network was Hutchison UK) through the normal method. It doesn't unlock but wait, this surprised me!!!

Installed iTunes 11.1.3.8 latest and downloaded ipsw 7.0.4. Put the phone into pwndDFU and restored the 7.0.4 stock via iTunes. After the restore iTunes prompted me something I'd never seen before, "a carrier update is available...do you want to apply the update...?" or something similar. I applied the update and VOILA!!!! I'm now using my SIM after one month of 'no service' thinking if it's worth paying $90 for the unlock

The carrier update file is jus a settings update, it does not unlock your phone.

What phone and which previous method did you use to unlock?