I have always avoided a different SIM card or picking up a cheap phone when travelling, assuming that it gives you a different phone number which would be a royal pain if nobody knew what number to call. I would be having to constantly check phone and SMS to see.
Seriously, since our Telus services work south exactly as they do in Canada, for us this is the best scenario. Text, calls and data all working and costing the same when travelling.
2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln