The downtime affected users across the UK for three hours on Monday morning before the network was fully restored at lunchtime.
One Vodafone user said, "I couldn’t use my mobile and when I tried using a land line to call a colleague on her Vodafone mobile I couldn’t get through either."
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A Vodafone spokeswoman said, "We believe the problem was caused by a broken server and we have apologised to those customers affected."