To understand roaming fees, it’s important to first understand what cellular roaming is.
Roaming is when your phone uses cellular data to access the Internet using a different network than your carrier. Depending on your carrier plan this setting may or may not be included with your plan. If it’s not, and you’re traveling overseas, you could incur some very large fees.
Even if you aren’t actually using your phone to make calls or send SMS messages, many apps use data in the background without you realizing it.
To avoid charges from roaming, you have a few settings on your phone depending on your needs:
Airplane Mode
Turn off cellular data
Turn off roaming
Although turning off cellular data and data roaming will prevent your phone from using data, these won’t necessarily stop phone calls and text messages. To completely avoid these costs overseas be sure to set your phone to AIRPLANE MODE.