The telecoms unit is central to the ambition of Chairman Mukesh Ambani - Asia's richest man - to make Reliance's consumer businesses as big as its energy operations, which currently contribute the bulk of group revenues and profits.
Jio marked a fourth straight quarter of profit in June-September, of Rs 6.81 billion ($93 million), compared with a loss in the same period last year.
Reliance, which in August became the first Indian company to reach a market value of Rs 8 trillion, said group consolidated profit rose more than 17 per cent in June-September to Rs 95.16 billion.
That was just shy of a forecast Rs 95.67 billion by 11 analysts, according to I/B/E/S data from Refinitiv.
The group's businesses include refining, petrochemicals, retail and telecommunications. On Wednesday it said it would also invest in cable television and digital cable distribution companies to widen its sphere of business.
It will pay Rs 20.45 billion for primary investment in DEN Networks Ltd and Rs 29.40 billion for a stake in Hathway Cable and Datacom Ltd.
Reliance said its EBIT for petrochemicals rose nearly 64 per cent in June-September, the second quarter of its financial year, from a year earlier to 81.20 billion rupees.
Its gross refining margin for the three months through September, or profit earned on each barrel of crude processed, was $9.5 per barrel, Reliance said in a statement.