If you own an iPhone, chances are you’re often battling with your handset’s meager battery life when out of the house. I own an iPhone 4, which has a bigger battery than previous iPhone generations. Yet, I still find myself shuddering repeatedly at the 20% and 10% battery life messages which appear on my handset’s screen day after day.

Yesterday, I managed to save my iPhone at 6% battery life before it crashed and died, something which would have happened, had I opened Facebook or Twitter.

If this sounds all too familiar to you, then you really should check out Auto3G – a jailbreak tweak which can significantly increase your iPhone’s battery life in a simple and easy way. The tweak (which is available in Cydia), switches your cellular data connection from 3G to 2G when the handset’s not in use.

As 3G downloads use up more power than 2G downloads, this switch obviously results in prolonging your iPhone’s battery life.

Auto3G has recently been updated, and several bugs have been ironed out – making this version more stable. It’s available in Cydia now, so be sure to check it out! And, if you do, let us know your thoughts regarding Auto3G in the comments below.

Thanks to iSpazio for spotting this!