Area code 408 covers several cities in California, including San Jose, Santa Clara, Campbell, Gilroy, Los Gatos, Milpitas, Morgan Hill, Saratoga, and Sunnyvale.

Area code 408 was established on March 1, 1959, as a split from area code 415.

The overlay area code for 408 is 669, and it was implemented in 2012.

Area code 408 has roughly 7.92 million available phone numbers.

The utilization rate of area code 408 is approximately 70%.

Area code 408 is projected to exhaust its available phone numbers by 2025.

Area code 408 primarily serves Santa Clara County and parts of Northern Santa Cruz County in California.

The major carriers in area code 408 are AT&T (40%), Verizon (30%), T-Mobile (20%), and other smaller carriers (10%).

Area code 408 supports landline, wireless, and VoIP phone services.

The California Public Utilities Commission (CPUC) regulates area code 408.

10-digit dialing became mandatory for area code 408 on October 20, 2012.

Area code 831 was created from a geographic split of area code 408 in 1998.

You can find more detailed information on the North American Numbering Plan Administration (NANPA) website.

Area code 408 primarily covers cities in the southern San Francisco Bay Area, including San Jose, Santa Clara, Campbell, Gilroy, Los Gatos, Milpitas, Morgan Hill, Saratoga, and Sunnyvale, spanning Santa Clara and parts of Northern Santa Cruz counties.

Area code 408 has an overlay with area code 669, implemented in 2012. This means both area codes serve the same geographic region, requiring 10-digit dialing for all calls.

Since October 20, 2012, 10-digit dialing (including the area code) is mandatory for all calls within area code 408 and to other area codes in California.

Area code 408 was originally established on March 1, 1959, as a split from area code 415. It later underwent another split in 1998, creating area code 831.

Area code 408 has about 7.92 million available numbers and currently has a utilization rate of 70%. It's projected to be exhausted by 2025.

The implementation of an overlay (area code 669) within the same geographic region as 408 necessitates 10-digit dialing to ensure calls are correctly routed.

The major carriers in area code 408 are AT&T (40% market share), Verizon (30%), T-Mobile (20%), and other smaller carriers making up the remaining 10%.

Originally part of 415, area code 408 was created in 1959. In 1998, it was split again, resulting in the creation of area code 831 to accommodate growth.

10-digit dialing (including the area code) is always required when making calls within or to area code 408, regardless of whether it's a local call or not. This rule has been in effect since October 20, 2012.

Area code 408 is primarily located within Santa Clara County, California, and also covers a portion of Northern Santa Cruz County.

Area code 408 is regulated by the California Public Utilities Commission (CPUC), adhering to guidelines set by the North American Numbering Plan Administration (NANPA).

Area code 408 supports various telecommunications services, including traditional landlines, wireless mobile services, and Voice over Internet Protocol (VoIP).

For further details about area code 408 and its regulations, consult the North American Numbering Plan Administration (NANPA) website.