I bought an iPhone 4S 16GB on Kijiji. The guy who sold it to me said it was unlocked. He used it on Bell Canada Network. I bought a Fido SIM and had the SIM activated. But when I restarted the iPhone it never clicked into the Fido Network. Instead it gave me this message: "The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone.Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information." How can I unlock the phone from the Bell network and use it on my Fido Network? Bell wants $75 for them to unlock it for me. Is there anyway to do this for free??