01389 548 Dialing Code


Dialing Code 01389 548 is part of Area Code 01389, which covers Dumbarton and the surrounding area.

The majority of numbers in the 01389 Area Code belong to normal landlines in Dumbarton, but it is possible that these numbers are being used elsewhere as virtual numbers.

There are multiple telephone companies operating in the 01389 Area Code and they are allocated blocks of numbers, which can be identified by the digits following the Area Code. In this case, the digits 548 after the area code indicate that the range of numbers was originally allocated to Colt Technology Services on 10 May 2023, although due to number portability, individual numbers within this range may now be allocated to other operators.

01389 area code information

Area Code: 01389
Location: Dumbarton
Dialing Code: 01389 548
Provider: Colt Technology Services
Date range allocated: 10 May 2023
Call Costs: Normal landline rate
Area code required for local calls: No
Local number length: 6
Number format: 01389 548###
International number format: +44 1389 548###
Last code change: April 1995 from 0389.

This page was last updated on 18 May 2023.