Comparison Table
| Feature | NMT | GSM | UMTS (3GSM) | IS-95 (CDMA one) | IS-2000 (CDMA 2000) |
|---|---|---|---|---|---|
| Technology | FDMA | TDMA and FDMA | W-CDMA | CDMA | CDMA |
| Generation | 1G | 2G | 3G | 2G | 3G |
| Encoding | Analog | Digital | Digital | Digital | Digital |
| Year of First Use | 1981 | 1991 | 2001 | 1995 | 2000 / 2002 |
| Roaming | Nordics and several other European countries | Worldwide, all countries except Japan and South Korea | Worldwide | Limited | Limited |
| Handset interoperability | None | SIM card | SIM card | None | RUIM (rarely used) |
| Common Interference | None | Some electronics, e.g. amplifiers | None | None | None |
| Signal quality/coverage area | Good coverage due to low frequencies | Good coverage indoors on 850/900 MHz. Repeaters possible. 35 km hard limit. | Smaller cells and lower indoors coverage on 2100 MHz; equivalent coverage indoors and superior range to GSM on 850/900 MHz. | Unlimited cell size, low transmitter power permits large cells | Unlimited cell size, low transmitter power permits large cells |
| Frequency utilization/Call density | Very low density | 0.2 MHz = 8 timeslots. Each timeslot can hold up to 2 calls (4 calls with VAMOS) through interleaving. | 5 MHz = 2 Mbit/s. 42Mbit/s for HSPA+. Each call uses 1.8-12 kbit/s depending on chosen quality and audio complexity. | Lower than CDMA-2000? | 1.228 MHz = 3Mbit/s |
| Handoff | Hard | Hard | Soft | Soft | Soft |
| Voice and Data at the same time | No | Yes GPRS Class A | Yes | No | No EVDO / Yes SVDO |
Read more about this topic: Comparison Of Mobile Phone Standards
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