I just moved to the San Francisco Bay Area. My phone number's area code is from Massachusetts.

When I need to tell someone my phone number, I start to spell out the digits:

one-two-three,

At this point, the other person often points out that I need to tell them the area code. Because they're unfamiliar with my area code, they mistakenly think that I skipped it.

How can I go about spelling out my phone number in one go?

I just moved to the San Francisco Bay Area. My phone number's area code is from Massachusetts.

When I need to tell someone my phone number, I start to spell out the digits:

one-two-three,

At this point, the other person often points out that I need to tell them the area code. Because they're unfamiliar with my area code, they mistakenly think that I skipped it.

How can I go about spelling out my phone number in one go? Is there a common way to mark the area code when speaking out loud, or just "area code: 123, the rest is: .." would be the most succinct way?