Hi guys. Please excuse me if this this is a dumb question, but I am in the middle of making a deal on some wholesale priced Iphones. They are originally from Australia, and according to the info I have, they are locked to the "Telstra" network. Can the phones be unlocked and used in the US and other countries? If so, can I use unlocking software, or do they have to be unlocked with turbo sim? Thanks in advance for your help.