It's a good idea to check the roaming rates on these cards before you purchase.
Sometimes they're more than the rates a US carrier offers as part of its international roaming plans. There are other advantages to using an International SIM.
First, think about how you plan to use your phone while you're traveling.
Do you plan to make local calls and to text with people while in-country?
As a result, you might be charged for using certain features and services with cellular data.
Contact your carrier for more information about possible charges.
When cellular data is off, apps use Wi-Fi for data.
If you're using an i Pad, you might see Settings Cellular Data instead.You can turn cellular data on or off to limit apps and services from using the cellular network to connect to the Internet.