/ Snowdonia - best mobile coverage
I'd for Orange as it works in Beddgelert, Capel Curig, Ogwen Valley area as well as generally everywhere else.
Always had good reception with Vodafone in N Wales. Can't give you any particular 'not-spots'. Are you going to register the number to www.emergencysms.org.uk as suggested on here and by the SMC. It allows you to text to 999 in poor signal areas.
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