Tips that will protect your from giant cell phone bills
If you plan on using your phone in another country look into buying a travel data/talk package. It’ll be much cheaper than the standard rates.
If you don’t want to pay for a travel package, make sure to turn off your roaming and data on your phone. For example, the iPhone has an airplane mode that will turn those settings off.
Keep an eye out for wi-fi hot spots. Most Starbucks and McDonald’s offer free wi-fi and this is a great way to look things up on the go. Also make sure when that your accommodations offer wi-fi as well.