SANTA ANA, Calif. – Consumer advocates are looking to the courts to deal with what they say is an increase in the number of complaints about cell-phone carriers.

The Foundation for Taxpayer and Consumer Rights said it’s collecting the stories of upset wireless customers and organizing them in preparation for filing a new round of class-action lawsuits focused on alleged overcharges and poor service.

Complaints about wireless carriers have risen even though cell phones are increasingly popular.

As cell phones have become nearly ubiquitous, the industry’s total revenue has more than doubled, from $40 billion in 1999 to $88 billion last year.

Meanwhile, the government has imposed few regulations on wireless providers. Consumer groups such as the Foundation for Taxpayer and Consumer Rights say that leaves them no recourse except the courts, since companies aren’t responding to their concerns.

The Cellular Telecommunications & Internet Association, which represents most wireless carriers, says the industry works hard to address complaints, and that its overall track record isn’t bad considering more than half of all Americans use cell phones.

Harvey Rosenfield, founder of the Foundation for Consumer and Taxpayer Rights, disagrees.

“People are just outraged,” he said. “There’s not another issue that’s got people so angry.”

In October, his group filed lawsuits in Los Angeles against two carriers.

One against Cingular Wireless claims the company misled customers about the quality of its coverage, while imposing heavy termination fees.

A suit against Nextel complains that a new policy of charging for itemized phone bills makes it difficult for customers to identify billing errors. Both companies say those lawsuits are without merit.

Termination fees: These charges are incurred when a customer cancels service before the end of a contract, often because the customer isn’t satisfied with reception or is moving out of a company’s coverage area.

Termination fees generally run from about $150 to $300 per phone.

Extras: Providers have started charging fees above monthly calling-plan costs. For example, carriers now tack on charges to cover what they say are costs of complying with government regulations. Nextel charges customers to receive a paper bill with call details.

Billing: A recent Consumer Reports poll found that one out of four people had been overcharged by at least $10 on their most recent bill.

In response to such complaints, cell-phone carriers said they’d voluntarily start following procedures to make themselves more consumer friendly.

They include giving all customers two weeks to return new equipment before being locked into a contract.

Carriers unveiled the plan as an alternative to more stringent rules proposed by PUC Commissioner Wood. Citing concerns about what he says are unreasonable cell-phone termination fees, binding contracts that customers don’t understand, and inadequate company response to consumers’ complaints, Wood is trying to persuade the full commission to assume broad regulatory powers over cell-phone service.

In contrast, local phone companies have long had to comply with regulations covering everything from rates and billing to discounts for low-income customers.

Wireless companies are working hard to block passage of Wood’s proposal, partly because California is the biggest cell-phone market in the United States. It’s also influential in policy-making circles. Other states often look to California laws and regulations as a model, whether it be in telecommunications, health care or other areas.

Rosenfield’s foundation isn’t the only entity filing lawsuits against cell-phone companies.

A lawsuit filed in February in Los Angeles claims AT&T Wireless used “false and deceptive advertising” to bait customers with one plan, then convince them to buy more expensive ones.

Another suit filed against the company last month charges it’s broken the law by refusing to prorate bills on accounts canceled in the middle of a billing cycle.

AT&T spokesman Art Navarro declined to comment on the suits, which are making their way through the system.

“As a matter of policy, we don’t comment on pending litigation,” he said.

“But as a matter of principle, we make every effort to be open and above-board with our customers. … That’s how we keep their business.”