I just bought a new iPhone (baseband version 04.03.13_G, bootloader 4.6_M3S2), only to figure out afterwords that this version cannot yet be unlocked. OK, but then I found this thread: http://modmyifone.com/forums/showthread.php?p=170609 which said that you can use it with the Pay-As-You-Go plan. I followed those instructions, but, with the phone jailbroken in 1.1.1 or in 1.1.2, I continually get the "Incorrect SIM This iPhone must be used with an approved SIM" message. I've followed a few different jailbreak tutorials, and I never see the Incorrect SIM alert in the screencaps shown with the tutorials the way I have on my phone. This happened with the original SIM, the original SIM after I tried to activate it for PAYG on the AT&T site, and a fresh AT&T PAYG SIM. I've searched around for solutions for this, but I can never tell if people are referring to the new updated iPhones or the older unlockable version. Either way, I haven't come across any suggestions that have worked for me. If all else fails, I can try to upgrade back to 1.1.3 and try to fail the credit check with 999-99-9999 (though that didn't work when I tried it at first, before all the jailbreak stuff) to get the month-to-month option. Any suggestions are appreciated!