> ## Documentation Index
> Fetch the complete documentation index at: https://docs.teamfollowup.ai/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Use the public API base URL: https://api.teamfollowup.ai/api.
> Authenticate public API requests with Authorization: Bearer YOUR_API_KEY.
> Use product-owned terms: agents, calls, campaigns, contacts, phone numbers, billing, and configuration.

# The phone number people see

> The caller ID is the number that shows on a person's phone when you call. It has a big effect on whether they pick up.

When your agent calls someone, a number shows up on their phone. That's the
**caller ID**, and it matters more than you'd think. People screen calls. A number
they recognise or trust gets answered. A random one gets ignored.

## You give the campaign a number to call from

Every campaign needs at least one number to call from. You pick it from the pool
of numbers on your account, and attach it to the campaign. From then on, that's
what people see when the agent calls.

## Local numbers get answered more

A number with the same area code as the person you're calling feels familiar, so
more people pick up. If you're calling one region, use a number from that region.
If you're calling all over, you can attach several numbers so calls come from
something local to each person.

## A quick word on trust

The caller ID is a promise. If it says a local business and the call is a good,
honest conversation, you build trust. Use real numbers, don't try to disguise who
you are, and keep your calls genuinely useful. That's what keeps your numbers
healthy and your pickup rate high over time.

<Note>
  An outbound campaign really needs a number attached before it's worth turning
  on, there's nothing to call from otherwise. See
  [Going live](/campaigns/going-live).
</Note>