Several GP surgeries are unable to field calls from patients due to what has been described as a "national issue".
The surgeries in Norfolk have said the issue is impacting both incoming and outgoing calls.
Technicians are said to be investigating the problem "as a matter of urgency".
A spokeswoman for Humblyard Practice, which covers Hethersett, Mulbarton and Cringleford, said on Monday: "We are currently experiencing a national issue affecting our telephone system, impacting both incoming and outgoing calls.
"Our telephone provider is aware of the problem and is investigating this as a matter of urgency.
"If your problem is urgent, please come into the surgery and speak to our team.
"If your problem is routine, please use our online consultation service where possible.
"We apologise for the disruption and appreciate your patience. We will provide a further update once our telephone service is back up and running normally."
A similar statement also appeared on the social media of Hingham Surgery, which said: ". If you require medical assistance in the meantime, please visit NHS 111 online, call NHS 111 or in the event of an emergency, call 999."
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