I'm on Boost Mobile and it's been a week since I rooted with Revolution. Everything was working well till this morning when I needed to make an important call. After getting the error 16 I was forwarded to a Sprint CSR who asked me for name, phone number, and model of phone and explained my phone had "fallen out of sync" with the network and that he was "making an adjustment" that should fix it. Then he told me to pull the battery for 30 seconds, reboot, and try a call. All is well again. If there is a next time, I'll just try the batt pull and hope that fixes it. Thanks for that info! [Edit - I should clarify that I found this thread through a websearch for "sprint error 16" and didn't notice this is an EVO 3D specific thread.]