(Telecompaper) MTN Group subscribers decreased by 1.4 percent in the first quarter to about 229 million at the end of March, impacted by the disconnection of subscribers in Nigeria due to the subscriber registration required there. In a quarterly update, MTN said group revenue for the quarter was boosted by the significant year-on-year depreciation in the rand against a number of the operational currencies. Constant currency (organic) data revenue increased by 20.1 percent annually, contributing 24.2 percent to total revenue. Voice and data traffic increased by 12.1 percent and 123.3 percent respectively year-on-year.