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Fix iPhone 3G/3GS Battery Drainage & Overheating Problems on iOS 4.1/4.2.1

Last weekend, iPhone Dev-Team released Ultrasn0w 1.2 to unlock iOS 4.1/4.2.1 on iPhone 3GS/3G. After unlocking baseband 06.15.00 with Ultrasn0w, many users reported drastic drop in iPhone battery level and iPhone overheating issues. Sherif Hashim, a known iPhone baseband hacker, has shared his thoughts on the mentioned problems and suggested some possible resolutions. Details after the break.

Update by Sherif Hashim

Sherif explains that these problems are not actually inherited from Ultrasn0w but it's the hactivation process which is causing these problems. Hactivation is a process allows you to activate your iPhone without using an official carrier SIM via jailbreak tools like Pwnagetool or Redns0w.

Main problem lies with iOS 4.1 and iOS 4.2.1 IPSWs, unlike old the firmwares, they keep searching for valid push certificates all the times via your Wi-Fi or cellular data network (3G/EDGE/GPRS) which will eventually lead to battery drainage and overheating issues.

Following are few resolutions shared by Sherif to these problems:

  1. Try to activate your phone with an official carrier SIM like AT&T etc. If you don't have the official SIM, you can borrow it from your friend for a while. It will bar the search for valid certs in iOS 4.1/4.1.2.
  2. If you can't get hold of an official carrier SIM, turn your cellular data and Wi-Fi services off while you are not using them. To quickly toggle these services, you may use SBSettings available in Cydia. [via S.H]

Update1: Activate iPhone with SAM to Solve Battery Drainage & Overheating Issues

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    fabio11 years ago

    activate with the official carrier SIM means just put it into the iphone and then put my carrier SIM back in? or do i have to do anything else?

    thanks guys.

      Maverick11 years ago

      Yes. You are right. When you’ll activate your iPhone with official carrier SIM, it will stop looking for valid certs. After that, you can use any other SIM.

      Alternatively, you can use “SAM” as well. Follow the details posted here.

        fabio11 years ago

        thanks! i think it worked.

    Radu11 years ago

    Hi guys,

    Yes I can confirm A. Without a SIM activation, the battery life sucks big time. After an activation made with an AT&T SIM (my case), everything is fine now (battery back to normal etc.).

    As for B, I am afraid the advice was not applicable in my case. Even with data and wifi turned off, the battery was simply vanishing before my very eyes.

    Good luck!


    Mat11 years ago

    You are welcome Maverick.

    Steve jobs4theboys11 years ago

    Thank you all !

    MAT11 years ago

    Thanks sooooo much for the latest unlocked techniques, now my iphone 3gs is back.
    Yes, just wanna add little comment about the battery drainage; had this problem right after jailbreaking and unlocking it. Need to charge it every 7 hours.

    Here what i did to keep my battery last long;
    By installing multiflow (from cydia) instead of using native multitasking from ios 4.1 and installing multicleaner also from cydia to completely close all open applications after using it by holding down home button.
    Amazingly, Since then my iphone 3gs on ios 4.1 battery level still around 75% after 24 hours from last charge, although the wifi and 3g was on for 24 hours non stop. But the DATA toggle on sb setting remain off all the time.

    Hope this will help others,i meant it worked to my iphone,,,,so just give it a go.
    Thanks for reading.


      Maverick11 years ago

      Thanks for sharing MAT!