Hi i have a 2G 16gb Iphone that I purchased from asia prior to the ipone's coming out in Australia. The phone was not locked and my telstra sim card worked as soon as i put it in the phone, it also adjusted and worked to my existing itunes version. Now i want to upgrade/update my itunes so i can purchase movies and the like, however, before i do so, i want to make sure that my iphone wont lock. Is there anyone that can answer this question and give me basic advice on whether i can update my itunes to 7.7.1 and if i do whether it will lock my phone, and if my phone locks what do i do then? Im not up with the technology and what locks iphones and how to fix locked iphones etc.... If anyone can help that would be great cheers!