If you're using an Android phone, a worthwhile precaution would be to disable Auto-retrieve MMS on any app that you have loaded. If you can't disable, then un- install app or disable app and wait for patch. There is an app(Google play -Zimmer inc) to test if you have a vulnerability or infection.

My phone was listed as vulnerable

I disabled Auto-retrieve MMS screen shot the results

I will wait happily until new updates come in before I re enable MMS

 

Used what's app , ever since I was charged for an mms once

Its probably full of the worst kind of intrusion as well

 

Go into sms messages, settings, multimedia messages, disable auto retrieve, and don't download a message from an unknown sender.