CLEVELAND -- Busy circuits to billing problems -- it seems everybody who has a cell phone complains about their service.

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Jenifer Esteves said she couldn't live without her cell phone. But that doesn't mean she's happy with her cell phone service.

"I get dropped calls, dropped lines," she said. "I don't get reception in my house, where I work."

David Heim said a survey last fall of more than 20,000 online subscribers to Consumer Reports showed Esteves is not alone.

"Our survey showed that one person in five was dissatisfied with their cell phone service," he said. "Now that's a higher rate of dissatisfaction than we see for many businesses and services that we rate."

The cell phone survey showed all major wireless companies had significant problems.

For example, Cingular phone customers were more likely to complain of overloaded circuits.

T Mobile customers had more trouble connecting in some cities.

And Sprint PCS customers had more problems with dropped calls.

Customer service and billing were also problems. Cingular, Nextel and Sprint were not as responsive as other companies to questions and complaints. Nextel also had more billing problems.

Heim said 33 percent of the Consumer Reports subscribers surveyed said they were seriously considering switching carriers.

"Well, you can face high early termination fees, for one thing," he said. "And right now, you can't take your phone numbers with you if you switch carriers. That can be a big deterrent for a lot of people."

Esteves said that's the only reason she hasn't switched to a new phone company.

The Federal Communications Commission announced that, starting in November, wireless companies must let people keep their number if they switch carriers.