(Reuters) -AT&T Inc on Thursday posted a 2.5% rise in core wireless revenue for the first quarter, as the telecom giant benefited from the expansion of its fiber internet and 5G services.

The Dallas, Texas-based firm – whose WarnerMedia unit completed its merger with Discovery Inc earlier this month to form the new media firm Warner Bros. Discovery – added 691,000 monthly phone subscribers during the quarter.

AT&T is refocusing on its original business of providing internet and phone services after unwinding a years-long effort to become a media and entertainment company.

Shares of AT&T rose 1.5% to $19.73 in premarket trading.

The company’s revenue for the core wireless business rose to $29.7 billion in the first quarter from $29 billion a year earlier.

Total revenue, however, was down more than 13%, reflecting the impact of its divested satellite TV business and weakness in its business wireline unit.

Total global subscribers for premium TV channel HBO and streaming service HBO Max, which are part of WarnerMedia, rose by 3 million from the previous quarter.

Net income attributable to common stock fell to $4.8 billion, or 65 cents per share, from $7.5 billion, or $1.02 per share a year earlier.

(Reporting by Sonia Cheema and Eva Mathews in Bengaluru and Sheila Dang in Dallas; Editing by Anil D’Silva and Bernadette Baum)