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check and make sure your phone is not set to 3g, set to lte, then it will only go to 3g if there is no lte/4g. That setting is in the settings app

If you have a Canada /US plan you only need to be sure roaming is turned on on your phone, you may have to turn data roaming on as which is a setting in some phones. I operate close to the US border and into the US. I have never had issues