Just make sure to turn off your cellular and data roaming so you don’t accidentally get stuck with charges. To do that on an iPhone, go to “Settings > Cellular” and click the switch next to “Cellular Data.” Also go to Cellular Data options and make sure “Roaming” is turned off. On most Android phones, go to “Settings > Mobile Networks > Data roaming access” and then click on “Deny data roaming access.”
The memory on your mobile phone determines how much data you can store on it. Some phones have a predetermined memory capability that is built into the phone. You cannot change the memory amount on these phones, so be careful when you pick a phone that it has the memory amount you want. Internal memory starts at 1GB. A phone with expandable memory, on the other hand, uses a chip for memory. This means that you can replace the memory chip on your phone with a chip that his more memory later.
If you'd prefer to use a different Android phone or an iPhone, T-Mobile remains a strong alternative, letting T-Mobile One subscribers use data in more than 210 countries, though at 2G speeds. You can talk and text for free in Canada and Mexico, though T-Mobile limits you to 5GB of LTE data in those countries. (Be aware that the carrier's new T-Mobile Essentials unlimited plan doesn't include these international perks.)