01389 558 Dialing Code


Dialing Code 01389 558 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 558 after the area code indicate that the range of numbers was originally allocated to Belgacom International Carrier Services SA on 16 September 2021, 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 558
Provider: Belgacom International Carrier Services SA
Date range allocated: 16 September 2021
Call Costs: Normal landline rate
Area code required for local calls: No
Local number length: 6
Number format: 01389 558###
International number format: +44 1389 558###
Last code change: April 1995 from 0389.