Three, Voda promise £10-a-month or below mobile tariffs in bid to sway CMA on merger

Tie-up probe concerned the pair's union would mean higher bills, hurt MNVOs

Vodafone and Three UK have pledged to maintain retail mobile tariffs at £10 or below for at least two years after their proposed merger, in response to the UK market watchdog's insistence their alliance would lessen local competition.…