I have an iPhone 5s that was recently unlocked by the previous carrier(its been confirmed by them that the process is complete), and I now have a SIM card from Koodo. I've tried activating the phone with the sim card countless times but it just keeps saying "SIM not supported". I've tried erasing all data off the phone and restarting the whole thing, but it's still not working and now I can't get into it at all. I'm not sure what went wrong and am totally lost. What should I do?