User behaviour has also changed. As Table 3 shows, the number of minutes that an average subscriber makes calls every month has also crashed over five years. To start with, people started sending SMSes instead of calls, as Table 4 shows. But that number, too, seems to have decreased of late - reflecting, perhaps, the increasing popularity of instant messengers, as well as Trai's controls on bulk and spam SMSes.
Thus, how telcos make their money has altered as well. As Table 5 shows, call charges are no longer completely dominant in their revenue stream. For CDMA networks in particular, there has been a decline of 20 percentage points in their contribution to revenue. SMSes, meanwhile, have not picked up all the slack, as Table 6 shows. Rental charges, too, have taken a beating of late, as Table 7 reveals. Table 8 shows why some networks will be more worried about roaming than others: it usually provides 10 per cent of GSM revenue, but under two per cent for CDMA. (Click here for table)
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