Help with jailbreaking and Cydia for iPhones, iPads, and iPod touches.

Pangu provides an iOS 9.0 untethered jailbreak. TaiG provides an iOS 8.4 and 8.3 untethered jailbreak.
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You can use Cydia Impactor if you need to un-jailbreak an 8.1-8.4 device without restoring.
Instructions for jailbreaking iOS 8.0-8.4.
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what does the app 'ultrasn0w' in cydia do? (

asked 12 Feb '11, 14:17

pietergoed's gravatar image


edited 13 Feb '11, 18:46

gomanski's gravatar image


  • Ultrasn0w is an unlock solution developed by the iPhone dev team. Currently it unlocks modem firmware known as baseband, unfortunately only certain basebands (BB) are supported.
  • iPhone 4 : 1.59.00
  • 3G/3GS : 04.26.08 , 05.11.07 , 05.12.01 , 05.13.04 , 06.15.00
  • You don't need it if you are using the official sim card for the phone.
  • If you decide to update your firmware you need to make sure that you use tools like tinyumberella to update as it prevents the baseband from updating cause once you update your baseband there is no going back.
  • once you install ultrasn0w you can use any sim card to send and receive calls.

Good Luck~ w11z


answered 13 Feb '11, 19:24

w11z's gravatar image


edited 13 Feb '11, 19:29

To add (and to be a little more technical), it overflows a buffer everytime the iPhone boots. That's how you're able to use your phone with all the carriers :)

(14 Feb '11, 10:23) crabbie crabbie's gravatar image

With this source, you can unlock your device.

Example, if the iPhone mobile is locked with AT&T, then once this source is installed, you can use your AT&T purchased mobile with any other carrier.

However, 4.1 & 4.2.1 are still not unlockable. Unless you updated to these versions, while preserving your baseband.


answered 12 Feb '11, 14:55

ElMajdal's gravatar image


4.1 and 4.2.1 are not baseband versions, although you are partially correct in that updating to those versions will update the baseband on phones from earlier revisions.

The baseband for your phone can be found in Settings > General > Modem Firmware.

(13 Feb '11, 18:48) gomanski gomanski's gravatar image

so does this mean that if you iphone is not locked to a carrier, you don't need ultrasn0w to be able to use the phone to make calls or surf the web?

(04 Apr '11, 13:46) dotzeno dotzeno's gravatar image


(04 Apr '11, 13:50) venusanann venusanann's gravatar image
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Asked: 12 Feb '11, 14:17

Seen: 19,364 times

Last updated: 04 Apr '11, 13:50

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