The majority of Latin and central American countries, and the US, Mexico and Canada use the TDMA 800 and 1900 MHz and CDMA 800 and 1900 MHz digital mobile phone standards, the exception is GSM 1900 MHz standard which is available in the US, Canada and some parts of Latin America. Several proprietary digital mobile phone standards also exist along side GSM, TDMA and CDMA standards, such as: PDC 800 and PDC 1500 MHz standard in Japan; and the Nextel (iDEN) standard in the US, and many parts of Latin America. Digital mobile phone standards appeared in the 1990s.
In many parts of the world, the older analogue standards such as AMPS 450 MHz standard,(non-digital version of TDMA); TACS 900 MHz standard, and the NMT 450 and 900 MHz standards are still being used since the 1980s.
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