AT&T Wireless has solicited an acquisition bid from minority stakeholder NTT DoCoMo in an effort to increase the field of suitors and its selling price, according to regulatory filings.

The company is also reportedly weighing a $30 billion cash offer from Cingular, the mobile joint venture between SBC and BellSouth.

DoCoMo already owns 16 percent of AT&T Wireless. Yesterday, the Japanese mobile carrier agreed to temporarily waive its right to be notified about takeover bids for AT&T Wireless -- a procedural move to avoid conflicts-of-interest with other bidders.

A spokesman for AT&T Wireless declined to elaborate on the process, while a spokesperson for DoCoMo could not be reached by presstime.