I had a missed call from an unknown cell number a while ago (a month or more) and had decided at one point to send a txt querying the call, but decided to call instead to confirm if it was a wrong number, which it was.
I deleted the txt I had started, but it reappears as a draft (green icon)every time I reboot the phone.
Has anyone else experienced this and if so, is there a way to fix it, or is there a simple reason for this?
Just do an OS update or reinstall if you like the version you have now. It's time consuming but very easy, and it's guaranteed to solve it. And by the sounds of it, if you've been having the issue for awhile, that's the only way you'll solve it.