I have the Samsung S7. it's been a couple of months since mine started. Here is what I've learned. 2 factory resets. They don't work. It attaches to almost anything, mainly websites. once you visit and it's hitched a ride it makes its home on your phone. You c as none get things for aware, mal ware etc. the popup may be gone but it's still there.
AT&T norms their customers they need phone replacement. This is actual stores not detached retailers that still have AT&T signs in front. They also advise to use the phone as a phone only. Do not go into banking or sensitive information areas. They can and have been accessed.
They also said that it will go through firewalls, security, and any mobile security downloads. This is also why there isn't a solution to remove it.
I can tell it is continually making my phone worse. If I send a picture the receiver gets a distorted picture with strange blocks of color starting at the bottom getting a little better at the top. The keyboard doesn't keep up with typing, The volume will increase and decrease on its own. Even if I hold the button it won't respond. if I hold volume up it will bounce back and forth and go to minimum. without touching the phone the volume will adjust on the phone.
The list goes on and getting worse. AT&T has advised me to switch out the phone immediately because the impact of this could cause severe damage to my accounts and it is destroying my phone.
Needless to say, I have to get another phone this weekend. The phone companies are aware of this. AT&T definitely is.
Please be careful with your sensitive information. if your phone starts acting up you have to replace it. (Technically should be done when problem starts).
Good luck to all. May they find a way to stop the new way to invade, screw up, steal info and damage our phones.