I was in Niagara Falls and Toronto over this past weekend and had paid $5 for international roaming prior to my trip. While I was in Canada I was able to send and receive text messages (I did not try any calls), however, I was never able to access any data for the most part. I have a Nexus 6P and double checked and made sure that I had enabled data while roaming, which in fact was enabled.
Is there no roaming data in these parts of Canada, or was this most likely a different issue? Back in the spring I had traveled to Mexico and was able to get service just fine while I was still on my T-Mobile Prepaid plan before I switched to Mint, so that should indicate that my phone is able to roam without any issues. I also know here in the US when I roam I typically cannot access data due to the abysmal speeds I get, so perhaps Mint just has very low roaming data prioritization.