(AP) -- AT&T wireless customers in Los Angeles County are texting and making calls again after technicians fixed a widespread outage.

AT&T Inc. spokeswoman Meredith Red said Sunday that a hardware failure led to problems with about 900 cellular towers across the county.

The service glitches began at about 3 p.m. Saturday and contributed to an evening of missed, dropped and failed calls. Service was restored early Sunday morning.

Red says it's unclear how many wireless subscribers were affected. Users complaining about their lack of service made AT&T one of Twitter's top trending topics for Los Angeles.

Red says technicians are working to pinpoint exactly what caused the equipment failure.

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