There's no record on the forums of anyone having this problem, but perhaps someone's here has had it an got it resolved before posting a thread. When I try to make an outgoing call, I hear the message "Error number 16. [Spanish] Switch one-one-three." If I stay on the line, I eventually get connected to Ting customer service. Incoming calls ring indefinitely or get directed to voice mail after a normal number of rings, though I haven't figured out any pattern between the two. Text messages are also non-functional, but data works when I have reception.
I live in DC, and have tried to use the phone at work out in Maryland (definitely different towers), with the same error. I purchased the phone refurbished, was told that it had never been rooted, activated it over the weekend, and used it normally for about a day and a half (Sunday and Monday) before this problem came up Monday evening. Neighbors & coworkers with Sprint devices tell me they've had no unusual problems this week.
With help from Sarah at Ting Help & Support, I've performed an MSL reset, manually reprogrammed the MSL, MDN & MSID, and performed a factory data reset in android. Sarah noted that "Sprint has reported problems with the towers in your area", but I haven't heard from her since yesterday afternoon and would like to try even long shot fixes, if anyone has any suggestions. If you've heard of a problem like this before, I'd appreciate your thoughts on the matter. Prospectively: thanks a lot!
Edit - I've found these two pages, but neither has useful information. I can find no other reference to "Error number 16" or "Error 16" in the context of cellular carriers.