i was in Burlington,Vermont yesterday and was not able to connect to data at all. I do have a can-us plan.
I didn't have any problem yesterday, but I was in NY, sometime in the middle of nowhere I didn't have a signal, but after a network scan, my phone was not able to find any operator.
Did you enable the data roaming?
Did you try to put in the airplan modem for a minute?
Have you tried restarting the phone?
Or try to find an operator?
The steps for enabling your phone to automatically select a network varies depending on the type of phone. Here are two examples:
Android: Settings → Connections → Mobile networks → Network operators → Search networks
iPhone: Settings → Operators
Check to see if your Canada + USA plan is activated: Go to Overview - Manage