I had the same problem. I needed the help of a MOD to fix this. In my case, the problem was related to the US Roaming Add on. Did you use that add on recently?
Thanks for the community and the MODs for your assistance. A MOD was able to fix my service problem by the next day and indicated that this was likely due to the US Roaming Add on. I just needed to restart my phone after they fixed the problem on th...