Always verify if your phone is compatible with other networks. If your device is locked into a specific carrier, consider unlocking it so you can use a local SIM card on arrival at your destination.  Either way, you have options. You can purchase a local SIM card on arrival or opt for an international roaming plan from your home carrier. Don't forget to download travel apps and organization apps that can assist you during your trip.  If you forget to activate airplane mode, your battery will drain as it endlessly attempts to search for a wireless signal. This may also result in unintended roaming fees.