Hello I am not happy with the latest releases of iOS for my 3GS phone. Is it safe to perform the following instructions. My only reason is that I want to test battery, WIFI and 3G reception issues. I ...

The Pwnage Tool by the DevTeam hacker group allows you to create custom iPhone firmwares for the purpose of jailbreaking, to get full control over your device (see why you should jailbreak here).

Just a word of caution in case Apple decides to release an iPhone firmware update, say… tomorrow —or next week or whenever: if you have a software-unlocked iPhone, don’t update until it gets confirmed ...