4. Revenue

Revenue recognition

The group provides fixed-line, mobile, data communication services and communication-related products. The group provides such services to business, residential, wholesale, payphone and mobile customers. Revenue represents the fair value of fixed or determinable consideration that has been received or is receivable.

      Group       Company  
      2015
Rm		   Restated
2014
Rm		       2015
Rm		   Restated
2014
Rm		  
4.1 Total revenue     32 400   31 905       32 604   32 115  
Operating revenue     31 675   31 288       31 611   31 224  
Other income (excluding profit on disposal of property, plant and equipment, intangible assets and investments)*     442   454       487   504  
Investment income     283   163       506   387  
                         
4.2 Operating revenue     31 675   31 288       31 611   31 224  
Voice     15 590   16 237       15 594   16 242  
Interconnection     1 493   1 508       1 493   1 508  
Data     11 473   10 990       11 405   10 920  
Customer premises equipment     2 704   2 186       2 704   2 186  
Sundry revenue     415   367       415   368  

* Refer to note 5.

Operating revenue increased due to higher mobile voice and data revenue, higher IT business services revenue and higher equipment sales. This was partly offset by the continuous decline in fixed-line voice revenue and lower data leased line revenue resulting from self-provisioning by other licensed operators.

Change in estimate

In the current financial year the group reassessed its voice customer relationship period (CRP) that is used for the deferral of installation fee revenue. The CRP was changed from nine years to six and a half years. This is more reflective of the modern day customer behaviour within the industry. The change in estimate resulted in revenue increasing by R111 million in the current year.