I'm not sure how much control you guys have over this...
I've never had this problem on this site before, but suddenly, in the last couple of weeks, almost every time I enter the main News page on my phone, an unclosable pop-up blocks me from doing anything. I have to close the browser tab and re-enter the site.
Will have a look. It's probably related to your subscriber status. It's supposed to remove all ads.
Edit: Fixed now.