It is important to understand the roaming rules and rates of your cell phone service provider before traveling internationally, as policies may vary based on carrier. It is recommended to confirm with your carrier that international roaming is activated and to ask about the rates for the specific countries you will be visiting. You should confirm that your mobile phone is compatible with the networks in the country you are visiting, as certain functions (such as text messaging or data usage) may not be available. Ask your carrier about options to track your usage in order to avoid unexpected charges on your bill. Charges for international roaming may not appear on your bill until the next billing cycle after your return.