Area Code 559 requires 10 digit dialing for local calls. However, If you live in California area code 408 or 669, you must dial 1 plus the area code and the 7-digit number.

https://www.att.com/support/smallbusiness/article/smb-digital-phone/KM1195588


Dean
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Please don't confuse your "Internet Search" with my licenses, certifications and over 30 years experience.

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