i just purchased my first smartphone (samsung galaxy j7 v 2nd generation) from the local Verizon franchise store. Before I ever installed any apps, I noticed that ads were opening up when I started the phone. Now they show up during phone calls. I have been looking through the web for a solution but I can't find anything specific. One article said I needed an antivirus app so I downloaded AVG. It didn't find any problems. What app is doing this? What can I safely uninstall? Thanks for any help before I take it back and switch back to a flip phone from Cricket!