i have 2g phone that I upgraded some time ago to 2.2 using itunes. Tired recently to unlock it to use a tmobiile sim in the US. Bottom line is that unlock does not work. I have downgraded to 2.1 and used quickpwn, i have used quickpwn w/ 2.2, i have followed all of the iclarified vids etc. At this point, i have a working iphone (no-service att&t sim). It is running Cydia. I have tried bootnueter again. Any thoughts on how to unlock it?