Gsm Rehan Jun 2026

| Feature | GSM (2G) | UMTS (3G) | LTE (4G) | |---------|----------|-----------|----------| | Multiple access | TDMA/FDMA | W-CDMA | OFDMA | | Core network | Circuit + packet | Packet only (later) | Packet only | | Voice | Circuit-switched | CS or VoIP | VoLTE |

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