December 2nd, 2010 
ringtone7 
Qυеѕtіοn bу Digvijay: Hοw tο unlock iphone 3g ios4 tο υѕе unofficial sim card?
Yesterday i updated mу iphone 3g tο ios4 аnd jailbreaked іt. Bυt thеn i wanted tο υѕе mу “vodafone” sim card, ѕο i used cydia аnd downloaded ultrasn0w tο unlock thе iphone іt didnt work. I tried thіѕ 3-4 times bυt іt didnt work. Please suggest mе ѕοmе tips tο unloack mу iphone please..
Best аnѕwеr:
Anѕwеr bу keynowin
tеll mе уουr modem firmware
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You upgraded your baseband. Currently that baseband is not unlockable with ultrasn0w, as you have unfortunately exposed. You should have researched whether or not it was safe to do that, because now your phone is useless to you. Here is a method to upgrade to iOS 4.1 without upgrading your baseband, but it’s too late now as you can’t downgrade your baseband even if you downgrade your firmware.
iOS 4.2 will be released within a matter of days, and an unlock will be released after that…. though, I’m not sure if the unlock is just for those broadcast who have upgraded to 4.2 even as preserving their baseband.
ok . initially if u have 05.14.02 version and 4.1 firmware than u won’t be able to unlock it means u cannot use vodafone. i have 3g and i upgraded it with 4.1 firmware and now i m stuck. but
if u have 4.0.1 or 4.0.2 than u have to restore it again and use redsnow 0.9.5b5-5 version with 4.0 firmware. jailbreak it with 4.0firmware then download ultrasnow through cydia. that might work.
otherwise just wait few days. 4.2 firmware is coming up, so we will be excellent. i guess.
You upgraded your baseband. Currently that baseband is not unlockable with ultrasn0w, as you have unfortunately exposed. You should have researched whether or not it was safe to do that, because now your phone is useless to you.
Here seems to be a lot of confusion around the iPhone 3G, and how to unlock it. Here are tons of websites claiming/misleading that they can unlock the iPhone 3G with a software solution – they cant! Here is no software unlock available yet for the iPhone 3G, anywhere!
Three Different Techniques to Unlock an Iphone
http://www.macpassword.com/three-different-techniques-to-unlock-an-iphone.html