After i got blackra1n on my 3GS with ATT, i ran the unlock. It worked perfectly ( i tried it with a T-mobile SIM).So did the tethering hack. Since the unlock, i've been having random signal dropouts. I might be in the middle of a phone call and the signal bars will drop to zero, and then NO SERVICE comes out, after 5-10 seconds, the signal comes back up like nothing happened. I thought it could be a spotty location, so i tried it at work. I was receiving a phone call, the screen turned on showing the person calling, then after 2 rings, the phone showed "missed call" and the signal bars dropped again. I though it was my phone only, so i did blackra1n on my friend's 3G, he ran the unlock as well. He told me he got signal drop outs as well. I was using the tethering hack. I was downloading a 6mb file, out of the sudden, the transfer stopped and when i checked the phone again it said NO SERVICE. Im at work where i always have 100% 3G signal. I did a restore and installed blackra1n but not the unlock and so far, not one signal drop out (the bad part is that i dont have my tethering option anymore). Has this happened to anybody else?