Indian telecom firm Bharti Airtel, which has operations in Asia and Africa, has reported a 29% fall in quarterly profit owing to what it says are foreign exchange losses.

The drop marks the 15th consecutive quarter of declining profits for mobile operator, according to Reuters.

Consolidated net profit fell to 5.12 billion Indian rupees ($83 million) for its fiscal second quarter ended September 30 from 7.21 billion rupees a year earlier, Airtel said in a statement.

A weak Indian rupee led to forex losses of 3.42 billion rupees in the latest quarter, it said. The company's consolidated net debt was at $9.7 billion at end-September.

Bharti Airtel operates across 20 countries in Asia and Africa. India is its main market accounting for about 70% of total revenue.