A number of police forces in England and Wales are reporting the 101 non-emergency phone number is down.
At least 15 forces - including the four Welsh forces and the Metropolitan Police - say there have been technical issues with the line since 09:00 GMT.
The Met Police said calls were not being received via 101 but the 999 emergency line was unaffected.
The following police forces are reporting problems:
North Wales Police
South Wales Police
West Mercia Police
A list of alternative non-emergency numbers is available on the 101 website.
There are also reports the 111 NHS non-emergency line has stopped working in Scotland and England.Any callers in England unable to get through to the NHS 111 service are advised to dial 0300 0200 155.