Hand-over
As you move, the network transfers the handling of a call from one cell to another. The process happens automatically.

Hands-free
An important safety feature that's included with most of today's mobile phones. It permits drivers to use their cellular phone without lifting or holding the hand-set to their ear. Available as an accessory for most mobile phones.

HSCSD
High Speed Circuit Switched Data. An enhancement to GSM networks that enables data speeds to be boosted from 9.6kbps in multiples up to 57.6kbps, by combining timeslots. Orange has begun to use HSCSD for certain services.