Area codes / California / 738
The 738 area code
738 is an area code in California, in the Pacific time zone. Get a local 738 number for your business, shared by everyone who answers it, or bring the 738 number you already have.
738 at a glance
- State
- California
- Time zone
- Pacific
- In service since
- 2024
- Local calls
- Seven-digit dialing within the area code
Get a 738 business number
When you sign up for Onyx Phone, you pick a local number by area code: search 738, narrow it by the next three digits or the last four if you want something memorable, and it's yours on the spot. Which numbers are free changes daily. If you don't find one you like, 213 and 323 cover the same area.
The number rings everyone you assign to it, in the browser, on the iPhone and Android apps, and on desk phones, and texts from it are unlimited once US carriers approve your business. Your plan includes one number for each user, and more numbers are $5 a month.
Calling 738 customers
Local calls within 738 can be dialed with seven digits. Callers are on Pacific time, so set your business hours to match if most of your customers are here.
Calls from Onyx Phone show your business number, and once your business is verified, your caller ID name too, so 738 customers see who's calling.
Questions about area code 738
What state is area code 738?
Area code 738 is in California.
What time zone is area code 738 in?
Area code 738 is in the Pacific time zone.
Is 738 an overlay area code?
Yes. 738 shares its area with 213 and 323. Numbers in any of these codes ring the same region, and local calls there are dialed with all ten digits.
Can I get a 738 business number?
Onyx Phone sells US local numbers. When you pick your number, search the 738 area code; which numbers are free changes daily. If none are free, 213 and 323 cover the same area.
Can I keep the 738 number I already have?
Yes. Moving a number to Onyx Phone is free on every plan and usually takes 3 to 7 business days. You answer on a temporary number until it moves.
Included on every plan
Starter is $17, Business is $29, Scale is $42 per user a month, or less billed yearly. The plan includes a business number for each user and unlimited calling and texting in the US and Canada. Every plan starts with a 7-day free trial, and moving your current number over is free.
Area code data from the North American Numbering Plan Administrator (NANPA), file of October 24, 2026.