| Feature | GSM (2G) | |---------|----------| | Frequency bands | 850, 900, 1800, 1900 MHz | | Multiple access | TDMA + FDMA | | Security | A5/1, A5/2 (now broken) | | Data speed | 9.6–14.4 kbps (GPRS up to 171 kbps) | | Voice encoding | Full-rate, half-rate, EFR | | Range (cell) | 1–35 km typical |