Today my wife flipped out at me because her bill was $50 instead of $25. Since she hasn't exceeded her calls the culprit had to be MMS. Though she denied sending more than 3 of them this month (knowing its $0.50 each time).
Before you say it, yes she does use VIBER to send most of her pictures to people, but her technology-inept family won't install Viber so she's forced to use SMS for them.
Update: So I figured it all out and have edited this post to avoid further confusion.
It's her phone (Samsung Galaxy S5) automatically turning them into MMS once the chars exceed 480 (or beyond 3 joined SMS).
So in her settings I've made 2 changes:
- "Alert when converting to MMS", she'll then know what coming.
- Reject all outgoing MMS, so if somehow she misses the warning, it won't send anyway.
Very strange as from time to time I've sent the odd essay text and never had this problem on my phones past or present (Note3, Note1, Nokia E65 ….)
Cant answer your question but what happens if you disable the MMS settings. (Change a few so they cant go as such)? Only asking as we had the same issue with my missus sending a few MMS's so I have disabled it but havent been able to check yet.