You can use the Internet with your smartphone overseas, but international roaming (using data communication overseas) may result in expensive communication charges. To prevent this, turn on Airplane Mode from the time you board the plane until you return to your home country when traveling abroad.
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If you want to avoid roaming charges when you travel, you have a few options to consider:
Many travelers also recommend bringing a dummy wallet when you travel, which is an old wallet filled with expired or fake credit cards and some small bills. Money belts and neck wallets — those flat, cloth pouches that fit under your clothes — are the traditional ways to carry money safely while you're traveling.
Use Wi-Fi and Bluetooth in Airplane ModeIf the airline allows it, you can use Wi-Fi and Bluetooth while in Airplane Mode. You just need to turn them on separately.
Money belts and neck wallets — those flat, cloth pouches that fit under your clothes — are the traditional ways to carry money safely while you're traveling. They're meant to escape the notice of pickpockets and muggers, and some even have RFID blocking to keep your credit card and passport information safe.
Using credit cards for purchases and using ATMs to get local currency are the best options when abroad. Avoiding cash as much as possible won't saddle you with extra unspent currency when you leave a country.