CHRISTOPHER CAPOZZIELLO / The New York Times “I was at work, and I got so annoyed,” Taber Lightfoot, an assistant director at the Yale School of Management in New Haven, Conn.

If you thought spam on your computer was a bother, brace yourself: Spammers want to find you on your cell phone. Cell phones have become consumers' most personal technological devices. Some industry executives, along with consumer groups and security experts, are concerned that unwanted text messages on phones will be an even greater headache than unwanted computer messages.

Circuit City Stores, pressured by investors to raise its stock price, put itself up for sale yesterday and opened its books to Blockbuster and billionaire Carl Icahn to prepare for a possible offer. Blockbuster made an unsolicited bid of $6 to $8 a share for Circuit City in February, provided it could study the retailer's book

Leap Wireless shares jumped nearly 9 percent yesterday, after the San Diego fixed-price cell phone company said it added more customers than Wall Street had expected and reported rising revenue and a shrinking quarterly loss. Shares closed up $4.38, or 8.8 percent, at $54.48. In after-hours trading, however, they fell back to $50.75.

Sempra Energy gave $50,000 to one of Gov. Arnold Schwarzenegger's pet causes last month, just days after the governor complained publicly about activists impeding the Sunrise Powerlink proposed by San Diego Gas & Electric Co.

Although the current real estate market downturn eventually will reverse itself, agents should prepare for difficult times, California Real Estate Commissioner Jeff Davi yesterday told about 300 members and guests of the San Diego Association of Realtors.

NEW YORK – Citigroup's new chief executive, Vikram Pandit, plans to stick with a global banking model after months of intense review – but only after shrinking the company by about one-fifth first. The three-year plan, revealed yesterday, includes getting rid of more businesses, mortgages, real estate operations and jobs.