I was in the US for 3 days and I bought the 3 day unlimited text plan and it worked great. Now that I'm back in Canada, my phone won't find Koodo as a carrier. The only options that come up are AT&T and 302720. It's like my phone doesn't recognize I'm in Canada.
This image is a bit out of date, but the layout should still be similar. Take note that data can be turned off while keeping 3G on. Just make sure you flip the switches the other way: 3G ON, data OFF. Since you don't have data, you can turn your LTE switch to off as well, if applicable.