Cell phone compatibility issues on different countries

There are various different types of radio frequencies and encoding services which different cell phone services use - and if your phone doesn't receive the frequency and encoding of the local service, it becomes, of course, useless. Most cell phones in America uses single band frequencies, in Asia they used dual band. If you want a cell phone compatible in any frequencies, you might want to consider buying a tri band cell phone. Or, to get cell phone service in another country you need both a compatible phone and a compatible account. Your best bet is to rent a cellular phone, either in the US or overseas, but be sure you get one that will be compatible internationally in the countries you plan on travelling to. There are several different ways of getting airtime as well.