Plunging temperatures could cause mobile phones to cut out in a cold snap that will bring widespread snow and ice over the coming days.
The Met Office warned that heavy hail and snow showers could cause severe disruption on Monday morning as the half-term holiday gets off to a shivery start, with widespread sub-zero temperatures.
Mobile reception could be lost if icy winds dry air moisture on power cables and cause them to break, forecasters said.
Two yellow weather warnings for snow and ice are in place for large swathes of the south west, north west, Wales, northern Ireland and Scotland from midnight until Monday lunchtime.
It comes after a lost walker with badly frozen feet was rescued in blizzard conditions in a nine-hour operation in the Cairngorms on Sunday morning.
The foreign 56-year-old was found by the Cairngorm Mountain Rescue Team suffering from hypothermia. He was taken to the rescue base but required no further treatment.
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