very strange issue that I'm hoping others know the solution to, but since the 4.4 Update, I'm only able to send SMS when on Global network mode, but I get much faster 4G data using LTE/GSM/UMTS. Unsure what is going on, but I'm not even able to add APN's so I'm kinda screwed if I want to send normal SMS. Google Voice and Hangout messages go through just fine, though. So not all is lost.