Police are advising residents that one number will be available from September to report non-emergencies.
The current 101 number should be used to report crimes that have happened, suspicious activity or to get some advice from a neighbourhood officer.
Now police are putting across the message that old lines which began 03456 or 08456 will be switched off from September 1.
Chief Superintendent Laura Young, from the communications department, said: “We’ve been running several telephone lines for non-emergency calls to the police for well over a year as the 101 number got bedded in.
“Now we have decided the time is right to switch off the old numbers and we want to make sure the public are aware of this before September.
“In an emergency ring 999. For everything else ring 101.”