If you use an Android phone, it is susceptible to “Stage Fright” malware.
This seems to just affect MMS messages not SMS.
Here is advice from Steve Gibson to patch your phone.
- Get the latest phoneware update.
- ○ Disable Auto-fetching of MMS for both Hangout and regular messaging apps. ○ Open Hangout: ■ Options / Settings / SMS / Advanced ● “Auto Retrieve MMS” ○ Messages ■ More / Settings / More Settings ● Multimedia Messages -> disable “Auto Retrieve.”
Note – I noticed that Messaging was turned off in my Hangouts so I didn’t have to worry about that. I did turn off Auto-Retrieve MMS in my Messaging app.