Local schoolchildren have marked the switchover by burying a time capsule containing an analogue remote control, television listings guide and their drawings of televisions.
With analogue television and air traffic control currently using some of the airwaves, it was expected to take until the end of 2013 for this job to be completed.
O2 and Vodafone will not be able to offer 4G until other parts of the radio spectrum - including those previously used for analogue television and air traffic control - are freed up and sold off.