cellphone Mobile Phone Guide
In many parts of the world, mobile phones have become such a part of everyday life one wonders how we ever managed without them. For world travelers, mobile phones can offer some incredible benefits. However, they also present certain challenges, not the least of which is whether they will even work when traveling from one place to another.
Why Mobile Phones can be a challenge
Mobile phone usage for the traveler can sometimes be a bewildering affair. This is due to the preponderance of various differing -- and incompatible -- mobile systems, often delineating entire continents or regions. The main systems in use are outlined below. The purpose of this discussion is not to delve much into the technical aspects of each system -- that sort of thing can easily be found elsewhere on the web. Rather, here we'll focus more on where these systems are used and factors important to travelers.
AMPS - Advanced Mobile Phone System At one time, this system might well have been "advanced" compared to earlier methods. The original 800 Mhz analog cellular system introduced in North America in the early 1980s, now it's pretty much technically obsolete. However, even though it's been replaced by newer digital technology, in some rural areas from the US to Australia to Turkmenistan, it still might be the only mobile signal to be had. I often carry a pre-paid AMPS phone as a backup for non GSM-areas. An enhanced version called N-AMPS (Narrowband AMPS) offers some digital phone-like features such as text messaging. Most of the US now uses E-AMPS, for enhanced AMPS. Every country in the Western Hemisphere has 800 AMPS service, as well as American Samoa, Angola, China, South Korea, Lebanon, Nauru, Northern Mariana Islands, Solomon Islands, Turkmenistan, Uzbekistan, and Western Samoa.
D-AMPS - The first digital version of AMPS, also using the 800 Mhz spectrum. Still used (though not widely) in certain countries including Bolivia, Brazil, Canada, El Salvador, Israel, Malaysia, Myanmar, Panama, Russia, Ukraine, Uzbekistan, and Vietnam.
TACS - Total Access Communications Service The original European 900 Mhz analog system launched in 1985 by Vodafone. Still used in Austria, Azerbaijan, Bahrain, Cambodia, China, Democratic Republic of Congo, Gambia, Ghana, Hungary, Ireland, Italy, Japan, Kenya, Kuwait, Malaysia, Mauritius, Nigeria, the Philippines, Singapore, Spain, Sri Lanka, Tanzania, United Arab Emirates, United Kingdom, and Yemen. Uses a protocol known as Frequency Division Multiple Access (FDMA). Variations include ETACS (Extended TACS), ITACS (International TACS), IETACS (International Extended TACS, NTACS (Narrowband TACS and JTACS (Japan TACS).
NMT - An analog rival to AMPS and TACS that uses 450 and 900 Mhz spectrum. Still used in most parts of Europe and Asia, including Algeria, Andorra, Bangladesh, Belarus, Bulgaria, Cambodia, Croatia, Cyprus, the Czech Republic, Estonia, the Faeroes, Finland, France, Greenland, Hungary, Indonesia, Latvia, Lithuania, Malaysia, Morocco, Norway, Oman, Poland, Romania, Russia, Singapore, Slovakia, Slovenia, Spain, Swaziland, Sweden, Thailand, Tunisia, Turkey, Ukraine and Uzbekistan. Now that GSM is so widespread, some countries are planning to halt NMT service. In Finland, for example, NMT900 service was shut down in early 2000; NMT450 service will be discontinued at the end of 2002.
TDMA - Time Division Multiple Access The first digital network widely used in the Americas, this is the system which at one time was and still is largely the core of major US wireless networks like AT&T and Cingular. (Of these, however, AT&T and Cingular are now converting some US bandwidth to GSM 1900. They may also use the newer GSM 800, which operates at 850Mhz). Outside the US, TDMA networks can be found in Argentina, Aruba, Bahamas, Belize, Bermuda, Bolivia, Brazil, Canada, Cayman Islands, Chile, China (including Hong Kong), Colombia, Costa Rica, Ecuador, Guam, Indonesia, Israel, Malaysia, Mexico, New Zealand, Panama, Peru, Russia, St. Maarten, Suriname, Uzbekistan and Venezuela. Some industry analysts are forecasting that the increasing growth of GSM and CDMA in the Americas will eventually signal the end of TDMA.
CDMA - Code Division Multiple Access A rival to TDMA in the Americas, this standard was developed by QualComm, from which providers must license its use. CDMA carriers in the US include Sprint PCS (which oddly enough started as a GSM carrier), Alltel, and Verizon. There are now CDMA networks elsewhere in the world, including Argentina, Australia, Canada, Chile, Hong Kong, El Salvador, Guatemala, Israel, South Korea, Peru, Russia, Venezuela and Zambia. This offers some international roaming capability, though nothing like the near-global coverage available from GSM carriers. In the purest technical sense, CDMA is more efficient than GSM. In actual application, GSM has such widespread following and rich features to keep CDMA from being much of a threat. However, it's entirely possible that CDMA will contribute to the eventual demise of TDMA in the Americas, though that time is likely to be many years away for the US and Canada, and much longer for Latin America.
iDEN - (Integrated Dispatch Enhanced Network) iDEN is essentially a hybrid of TDMA digital cell phone and two-way radio. Providers are limited (examples are NEXTEL in the US and Amigo in Israel). Phone equipment is produced exclusively by Motorola, the company that created the standard by blending their historic experience with handheld radios with the expertise in cellular technology. Certain iDEN phones offer GSM 900 compatibility, making global roaming possible in many countries without iDEN networks.
PDC - Personal Digital Cellular Behind GSM and D-AMPS, the world's mostly widely used digital system, though its use is limited to Japan.
PHS - Personal Handyphone System A newer Japanese standard especially designed for high-speed data transmission up to 32 Kbps. Some installations may also be found in parts of China, Thailand and Taiwan.
For more information about systems and providers in specific countries, I highly recommend the world cellular reference page at Teletechnics Mobile Systems.
More to Come
This has been a general overview of mobile phone systems used around the world. I will soon add to the information here with specific tips travelers can use when selecting mobile phone service and options on how to best stay in touch with mobile service while connecting internationally. Please come back soon.
International City Dialing Codes