hello i am relatively new to the iphone i have a 3gs so please excuse me if i seem ignorant. i just updated to 3.1.2 and lost the ability to tether with my mac book pro my friend who works at at&t gave me a file that allowed me to tether with the older 3.0 but when i updated i lost the ability. he had sent it to e in an e mail and i just opend and installed it right on my i phone and it worked but not any more. is there any way to get it back ? any help will be greatly appreciated thanks
chris dorsey
chris dorsey