I have an S5 with wifi and data both always on. Sometimes I can receive picture messages no problem, and other times I don't see anything. No blank message, no notification, nada. This has occured with more than one sender. Any ideas how to fix this?
I think you should first try to take out the internal battery and do the reboot phone procedure.
After try to only have data or wifi on one at a time.
It also depends on what app you are using for your text messages.
Are you using the stock Samsung messaging app or another 3rd party app?