In particular, the country where you live, it is very important when it comes to international mobile phone celular) service. Most countries have one mobile phone standard known as Global or GSM mobile communication system. But no, the United States of America and the GSM standard, the competing wire carriers to create their own standards. So if you're from the United States and want to get another mobile phone security in the world with your existing equipment, you probably will not be able to do so.
So, let's go back to our opportunities for international mobile phone celular) service. It is important to understand that the key issues of effective international mobile phone service that you have to have a phone that will handle the frequencies plus a service that is compatible within the country, you are communicating. If you have a phone set, which is managed by the GSM service, then your phone will be compatible at least 212 countries around the world, to what extent. The only other item you will need to be associated with a service plan.
GSM frequencies operate worldwide typically 900 MHz, but more and more mobile phone celular) is 1800 MHz. There are several GSM phone services in the United States and Canada, but they work in 1900 and 850 MHz and is therefore incompatible with the rest of the world. That's why more and more we are starting to see tri-band phones sold, which is consistent with international and North American GSM frequencies. Nokia 3220 is a good example of how it will play both 1800 and 1900 MHz bands.
But what about the international mobile phone celular) service? If you get one of the tri-band phones can get a SIM card which can be used in many countries.