To reduce data usage, make sure you turn off cellular data and set your phone to “airplane mode.” You don't want your phone to grab data the minute you take it off airplane mode, even for a minute. Turn off or restrict background apps that refresh or update automatically, using data even when the app is closed.
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If you want to avoid roaming charges when you travel, you have a few options to consider:
Turn off Data Roaming or prepare for a trip. Need to avoid roaming charges because you arrived at your destination without an international data plan? Check your Cellular Data options and turn off Data Roaming. In the Settings app, tap Cellular, or Cellular Data, or Mobile Data.
Check your Cellular Data options and turn off Data Roaming. In the Settings app, tap Cellular, or Cellular Data, or Mobile Data. Turn on Cellular Data, then tap Cellular Data Options. Turn off Data Roaming.
One of the most affordable ways to stay connected while traveling is to bring your phone and buy a prepaid SIM card at your destination. A SIM card is the tiny removable card in your phone that stores information about your mobile identity, such as your number and wireless services.
If you know you're going to be out of a coverage area, or in low coverage, continue toggling AirPlane Mode on to conserve battery life when you're in a situation where you do not need any wireless communication. This will prevent the iPhone from constantly seeking a signal, which reduces battery life.