Incumbent Sure will face direct competition from JT, while Airtel-Vodafone believes it has an alternative with its 4G service.
The news comes in the wake of the regulator releasing its follow-up customers satisfaction survey in both Guernsey and Jersey.
'We are very much looking forward to when the fixed line market opens up later this year in Guernsey, when we will compete as we currently do in other services like mobile and broadband – with good service, a sensible price and innovation such as our investment in a high-speed fibre broadband network and trialling demand for fibre to the home,' said JT's deputy managing director Tamara O'Brien..
Airtel-Vodafone CEO Ian Campbell said the decision to open up the fixed line market to competition has come too late.
'We believe that the large majority of customers in the Channel Islands only pay for a fixed line telephony service so they can receive internet access through fixed line broadband,' he said. '4G will allow customers to access the internet up to 10 times faster than is currently available, on a mobile network without the need for physical wires into the home and being forced to pay for two sets of line rental.'
