Services were being impacted from around 7pm until 1am.
'I’d like to apologise to our customers for the problem with JT services yesterday evening,' said Daragh McDermott, managing director JT Channel Islands.
'JT’s networks are now working normally again after the problem, which affected landlines, mobiles and internet services in Jersey and Guernsey. Our engineers got to work immediately, and made sure services were running again as quickly as they could. We are now isolating the root cause and putting measures in place to prevent it happening again.'
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