I have the v10 on verizon, I noticed when I go into default messaging app tab and change it to either hangouts or messaging. I go back into my texts and it asks me do I want to back to messaging + and it doesn't let type or send any messages. Anybody know why this happens and why is there a option for these messaging apps of they don't work. Sidenote ( does anybody known how to change the size of the font on texts , can't find it anywhere.