I read every other posts but couldn't find a secure answer, yet. Is there a possibility to upgrade my iphone 3G to any higher version other than 3.1.2 ? I purchased my iphone from an At&t shop in US and when I was deployed overseas, I had to unlock it to use.
Has been almost 2.5 years and my iphone still stays where it is. Many applications are not working.
Please lead me to upgrade my 3.1.2 firmware 05.11.07 iphone 3G.