I recently took a trip to Niagara Falls with a couple family members, and as I was expecting, interesting things were happening with our phones near the border. However, I wasn't expecting this. My iPhone 6 (Verizon) simply switched to "TELUS", (Canadian carrier I believe) and there were many warnings of how using data, calling, texting, etc, would result in a sizable charge. Another family member's phone (Verizon iPhone 5) switched to "Roaming LTE" and then "ROGERS" (another Canadian carrier) None of us texted, called anyone, or used data at all, but it was just sort of... Interesting. Didn't think it would switch to a Canadian carrier. And why did my phone go to TELUS while another went to ROGERS? Explanation?