Cingular’s subscriber count has reached 25 million and its network will soon cover the 100 major metropolitan areas of the U.S. as it prepares later this year to acquire AT&T wireless.

Cingular said its revenues climbed 7.3 percent to $4.2 billion in its most recent quarter. The company said it has also updated its entire network to the GSM/GPRS standard six months ahead of schedule with 3-G network applications to be deployed next year. (GSM stands for Global System for Mobile Communications. GPRS is the acronym for General Packet Radio Service.)

The company added 428,000 customers over the past three months and 2.4 million for the year. Two recent deals have also enabled Cingular to expand its coverage for the top metro markets.

Operating expenses increased 11 percent to $3.5 billion, up 11 percent. The costs cut operating income to $680 million, down 10 percent, the company said.