I had a couple of days off when I upgraded to 8.1 so I was using my home's Wi-Fi for the whole first day. I didn't realize until I was coming home from work the next day that Internet Explorer doesn't work with my data connection. I can press the search button, type something up and have Bing return results, but anything Explorer tries to open results in an "Error: Cannot find server or DNS error." MetroTube lets me watch videos on data and the dedicated apps for Facebook, Twitter, Vine and Instagram also run properly, but nothing in Internet Explorer opens. This wasn't an issue in 8.0. It's annoying when it happens, but 8.1 is great otherwise. (Bell, Lumia 920)