Mobile phone users to use common codes from today Monday 8th September , 2014 10:12 am All mobile phone users regardless of the network will use a common short code to check their credits, top up and assess call centres from today. This follows the National Communications Authority’s (NCA) move to harmonize all short codes for general customer services across all networks. The NCA however says the existing short codes for the various telecommunicati on networks will run concurrently with the new one until April 2015. To recharge, subscribers will use 134. To check balance, subscribers will need to dial 124 and 100 for the call centre. The others are 600 for number portability, 400 for verification of SIM, 108 for Voice Mail Deposit and 109 for Voice Mail Retrieval. There have been complaints from users about the number of short codes they have deal with, prompting an investigation by the NCA, which eventually decided to introduce common codes.