I bought an iphone 4 second hand and it had ios 7 installed. I don't dislike ios 7.0.6 but I can't unlock even if I jailbreak it and install ultrasnow or SAM. I think the baseband is to high, but I could be wrong. I do travel for my job and I need an iphone that I can travel with and change the sim card as needed. I am almost certain that I can't downgrade the phone back to ios 6.1.3 because I don't have the SHSH blobs. Are the only routes availible to me.. 1. Jailbrake and get a Gevey sim card? 2. Contact the provider that the phone was locked to and see if they can unlock it for me? I would prefer a software unlock that I can do myself. Any help or insight would be greatly appreciated. Thanks in advance.