Methods to unlock iPhone 4 5.0.1?

[Dtpl]

I'm getting iPhone 4 for Christmas and I require an unlock. What are the unlock methods for iPhone 4 on 5.0.1? I'm not sure which baseband it will be because Im ordering from eBay and I dont think they list it. Which basebands are supported by UltraSn0w?

thanks guys

[-JailbreakeR-]

If you have to have an unlock the best way would be to just buy one from an apple store since they sell them unlocked. The problems with trying to keep a certain baseband is that "somehow" they usually get updated and you lose your unlock for good. Factory unlocked beats a software unlock any day of the week.

[Dtpl]

Can I just flash baseband to iPad baseband and use custom IPSW when updating?

[iYeow]

No, you can't

[Dtpl]

Then how can I unlock if baseband isnt 01.59.00? I can't afford factory unlocked iPhone 4

[-JailbreakeR-]

Then how can I unlock if baseband isnt 01.59.00? I can't afford factory unlocked iPhone 4

You can't. The gevey sim might work for you but there's mixed results with them.

[Dtpl]

Why doesn't flashing to iPad Baseband work? I did that on my iPhone 3G that didnt have a supported UltraSn0w baseband and it worked great. No way to downgrade baseband?

[-JailbreakeR-]

Why doesn't flashing to iPad Baseband work? I did that on my iPhone 3G that didnt have a supported UltraSn0w baseband and it worked great. No way to downgrade baseband?

The iPad baseband only works on a 3GS and has many issues by going that route. The 4 is different hardware so the baseband is incompatible. There is no way to downgrade basebands on anything newer than a 3G (fuzzy band), plus with the 3G its got to be a certain boot loader for that to work. Also before you ask there will be no way to downgrade the baseband in the future either.

[Dtpl]

oh ok ): Very last question: Will there ever be an unlock for iPhone 4 with different baseband than 01.59.00? I see only 01.59.00 has been able to unlock for a while

[-JailbreakeR-]

Chances are no. If it was gonna get done it would have been done already. I really don't think anyone's trying since they sell them unlocked now. Before they started selling unlocked phones the only way to unlock was from the dev teams (ultrasn0w). The old (iphone4)always gets dropped when new(4s) arrives.

[Dtpl]

Ok... i know I said last question but I'm determined to find a way to unlock without paying for factory unlocked...

Say its on 5.0.1 baseband 4.11.08

If I follow a guide that was posted to downgrade to 4.3.5, will it downgrade baseband to 4.10.1, then can I use custom IPSW from sn0wbreeze to install 5.0.1 again, to preserve baseband 4.10.1 to use gevey sim to unlock? Would that work, or am I just unable to unlock iPhone 4 period if on 5.0.1 on 4.11.08 bb

Im really sorry about this, but I really had my heart set on a newer, faster iphone (upgrade from iPhone 3G, not even 3GS, just 3G), but I require an unlock ):

[iYeow]

Baseband cannot be downgraded once updated

[Dtpl]

But I found guide how to downgrade 4.11.08 to 4.10.01? see here I dont understand how other people downgrade if you say theres no way?

[Simon]

But I found guide how to downgrade 4.11.08 to 4.10.01? see here I dont understand how other people downgrade if you say theres no way?

Wont work. Baseband can only be downgraded on iPhone 4 when Apple is still signing a previous firmware. They are no longer signing 4.3.5.

[Dtpl]

Isnt that what tiny umbrella is for? I downgraded iOS 4.2.1 to 4.0 without apple signature on iPhone 3G. Why can't you do the same on iPhone 4? (Im REALLY sorry about all of this, I'm trying to learn what can and can't be done on iPhone, but I'm having trouble figuring out why it can't)

[Simon]

Tiny umbrella allows you to downgrade your firmware (assuming you have the required SHSH for said firmware). It does not allow you to downgrade your baseband though.

[Dtpl]

Oh :/ I thought the firmware had like preinstalled baseband, so if you installed say 4.3.5 it would install baseband 4.10.01 Do you think there will be a gevey sim update to support 4.11.08?

[Simon]

Not with iPhone 4. iPhone 4 baseband requires their own set of SHSH (but they are Nonce SHSH which means they are unique for every restore which is why they cannot be saved like other SHSH). So the only time a iPhone 4 baseband can be downgraded is if Apple are still supplying these baseband SHSH (which they are not).

For iPhone 3G/3GS it is different but baseband can not be downgraded no matter what on these phones because Apple implemented a rule for baseband installation that only a baseband of equal or higher number can be installed onto a device. This is what causes the 1015 error when people try to downgrade iPhone 3G/3GS.

Not sure if there will ever be a gevey for 4.11.08.

[-JailbreakeR-]

Oh :/ I thought the firmware had like preinstalled baseband, so if you installed say 4.3.5 it would install baseband 4.10.01 Do you think there will be a gevey sim update to support 4.11.08?

It does in a sense but only if it's lower than the one bundled with the software. If its higher your stuck where it's at and you have to use a custom software when you restore the phone.

[Dtpl]

Ok thank you Simon, you've helped a lot.