The composition of revenue of GSM telephony operators reflects a shift in customer usage, too, evident in Table 3. Calls are a much smaller source of revenue than they were earlier; and SMS revenue has shrunk in the past two years as users turn to data-based messaging services like WhatsApp. Revenue from such value-added services has increased sharply. Thanks to these structural changes in the market, profit growth has declined, as Table 4 shows.
Market consolidation is clearly overdue, as Table 5 shows. The four or five largest operators have the lion's share of the market, but there are many other smaller operators with minimal subscribers squatting on spectrum. But the industry continues to be overloaded with debt, as Table 6 reveals, complicating the question of acquisition.
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