after successfully unlocking my new iphone and using a tmobile sim, the network issapears and says that the network is lost, I can just wait a few minutes and it will come back or just restart the phone. I had the same problem or a similar one that was widely reported in my treo 650 previously (same sim card) this sim is 6 years old and pretty beat up. Is it possible that just going to the tmobile store and getting a new sim card will fix the problem... Going to test with my sisters new tmobile sim tomorrow.

And also, btw, I am willing to provide unlocking service in or around Boston, MA untill I leave for school. Price for HW unlock is 150$