Browser opening spontaneously when unlocking the phone

[wimrp]

When I unlock my Note 4 the internet browser opens spontaneously on an Instagram page. Some folks claim that it is caused by an unnamed app, but I find no unnamed app under app manager. Can someone here please help?

 

[Dannydet]

It's not an unnamed app, it's a rogue app that you'll need to find and uninstall it.
Basically the app is full of adverts