Mobile phone networks could pay lower fees to the government for using airwaves, British telecoms regulator Ofcom said on Thursday, after it recalculated the value of some blocks of spectrum following a 4G auction two years ago. Operators EE, owned by Deutsche Telekom and Orange, Telefonica's O2, Vodafone and Hutchison's Three, could see their total annual fees fall by 10 percent on Ofcom's previous proposal to a combined 223 million pounds a year, the regulator said.