Mobile data grew strongly across the Singtel group's regional operations but these were offset by "significant currency headwinds", the company said in a filing with the Singapore Exchange.
Net profit in the three months to September came in at USD 727 million, down 0.8 per cent from the same period last year.
Revenue fell 2.9 per cent to 4.18 billion Singapore dollars, said Singtel, Southeast Asia's biggest telecom operator.
"Mobile data growth continues to be a key focus... While currency weakness has affected our reported numbers, our underlying performance is resilient," she said in a statement.
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A large portion of Singtel's earnings come from overseas after the company expanded beyond its small domestic market, making it vulnerable to currency movements. The firm's earnings are reported in Singapore dollars.
In Australia where Singtel has a wholly owned subsidiary called Optus, the Australian dollar fell a steep 13 percent against the Singapore dollar during the quarter.
The company also owns substantial stakes in key telecom operators in India, the Philippines and Thailand.
Singtel said its overall share of pre-tax profits from its regional associates was up 0.5 per cent to 632 million Singapore dollars.
"Across the region, all of the group's mobile associates saw sustained adoption of data services and customer growth," it said.