If you travel overseas, here are some ways to cut costs since international mobile calls can be pricey. If you replace the SIM card that came with your phone with a card that works in the country you are visiting, you get several benefits. First, you don't pay roaming charges for local in-country calls, although if you are calling back to your home country, you will pay international long distance charges. Second, if people in-country are trying to reach you, they don't pay for the international calls either. (Some of the networks overseas have the more enlightened method of calling party pays, but we won't go there for now.) You also don't use any minutes on your mobile phone account, which can be good if you have a limited number of minutes - when you travel, you don't think about all the time you are on calls. The trouble is if you are going to several different countries, then you need different SIMs and have to keep track of the numbers too. That gets onerous.