Joe is going overseas for the first time and wants to know what technology he should bring. Leo says that a good camera is a must. A laptop isn't really necessary, though. He should be sure to turn off data roaming on his smartphone because if he doesn't, he'll come home to a phone bill in the thousands. So, turn it off and just rely on WiFi. He should also cache maps with Google Maps so he can use them without requiring data.
What about local SIM cards? Leo says that Joe will need to have his phone unlocked in order to use them. Carrier locking will prevent using a different SIM card. Once the phone is unlocked, then he can buy a local SIM. #3 has a great low cost unlimited data SIM plan for the UK. Sara Lane loves them.
There's an app that is great for traveling called Field Trip. This app will give Joe information about the things around him as he travels. It's available free for both Android and iOS.
Joe may also need a power adapter. In most cases, an adapter is all he'd need, but if his device doesn't go to 220v, then he'll also need a converter.