I'm going to Ireland in June. My wife and I have iPhone 7+ from AT&T, and I've heard various things about whether they will work in that country. I heard that the Verizon version of the iPhone WILL, as it has the better (or works with more phone vendors) modem chips, but that the AT&T version of the phone will not work in Ireland or most other European countries. Has anyone actually been in Ireland with an AT&T brand iPhone, and...did it work? Thanks!