So this is a longshot. But I figure there might be members who are far more informed than I am regarding this. Well, taking it from the top, I recently renewed my phone contract and switched phones to a LG G3. Which I was only content with. Fast forward to a few months and my phone falls and the screen completely breaks. It has no insurance. I go there and they tell me I can repair the screen but that it won't be the same as it was originally. So I decided to look into a phone I actually want. Enter the Sony Xperia Ultra series. These phones are big and range from 6 to 6.4 inches, which was the maindraw for me. Out of these, the Xperia C5 Ultra caught my attention. Its a phone that came out this year, and seems to meet my requirements almost perfectly. There is one issue, however. It's not a phone that's available in North American markets. No biggie right? I can just buy an international version off the internet. Which is where Networks come in. My SIM card is 4G LTE. And I don't understand how it all works but there's a chance this phone might not be able to go into...4G speeds? I'm not even sure. I have done my research. I inquired three times to my carrier's costumer service and they said that it would work. But I am a non-believer and stubborn. Specially since I am getting mixed signals from the sellers on Amazon (that state it has no 4G LTE in NA). I've also scoured the web and found lots of numbers (Mhz...?) That say which signals it can get? I presume. So to do a tl;dr Will the Xperia C5 Ultra connect to my mobile data at 3G and 4G LTE speeds and will it work as long as its SIM?