Are you a resident or employee in the 510 service area? If so, as of last Saturday, you now must dial 11 digits to make a local call (1+area code + number).
This is because the 510 area code has run out of numbers and requires a new area code overlay (area code 341) to meet the demand of new telephone numbers.
Going forward, when a new number is assigned to the area, recipients may get either a 510 or a 341 number.
The 510 area code was created in 1991 when 415 was split between the East Bay and the Peninsula / Marin County.