Samsung S7 Edge user. Android 6.0.1
Issue: Only two of my contacts were showing up in blue font and also showing up with "chat" instead of "sms". My wife and my aunt. When me and my wife were both on wifi today at work our text werent sending. Then when we got home to our wifi they sent but all coming in as "chat" not "sms". Also my wife would text me and it would send it to me like a group text.. her name showed as the sender 3 times.. very annoying.
So here is how I FINALLY SOLVED it for us..
We both did these steps:
1. Force stop and clear cache for Message+, stock Messages, Contacts, Phone.
2. Make sure all notifications and permissions are OFF on stock message app.
3. Go into Message+ and turn off Notifications. Also turn off any setting that has to do with MMS and Wifi.
4. Go into Settings > Applications > Application Manager > More > Modify system settings
CLICK OFF for: Messages.
5. Go back into Message+ and restore your regular settings.
6. Reboot phone (or just put into airplane for a min and then turnn airplane off again)
Fixed.
Let me know if it works.