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The American system is for the standard GSM on 1900.

Both reference standards are the TDMA and the CDMA, this last one having the most recent but the least widespread technology.

Again, there are a variety of mobile phone operators (Verizon, Sprint PCS, Cingular, VoiceStream).

They are all differents and pricing depends on the usage... could range from $19.99 to...? Monthly price includes service fee and a certain amount of minutes. All the providers are pretty good in the cities but there is spottier service once you are in less congested areas of the country. Voicestream does not work well oon the West coast.