some notes:1. If/when you switch to a new device, sometimes things like Apple Music and other stuff might be set to download automatically in the background. Just be mindful there are services that just consumes data without you knowing. that happene...
Please note you might get a notification when you cross the border for buying roaming bundles (automated message). You can ignore them as you have a plan that includes roaming in US-CAN-MEX. So don't freak out.