Hi, first post on the thread. Yay. I have a Nexus S 4G on Sprint, still stock, no root, etc. When I try to run the PRL and Profile update it says it needs to place a special call. With the PRL update, the phone calls, beeps, then returns to the lock screen like it crashed or something. With the Profile update, it calls, beeps then says there was an error or does the same thing as the PRL update. Given, I'm trying this in a coffee shop with a rather poor signal, but I'm just curious: Has anyone been able to complete either process and what does this do? I've heard it was supposed to improve reception.