# The rules, handled in one place.

Sending SMS means meeting carrier and regulator rules: A2P 10DLC registration in the US, opt-out keyword handling everywhere, and sender-ID pre-registration in many countries. Bird runs each from one place and reports status through the API.

## Which regime applies to me?

What you have to register depends on where your recipients are and what you send. Most US application programs touch all three at once.

## Compliance, by regime

Each regime in depth — what it requires and how Bird files and tracks it.

## Register once, send with confidence.

Compliance is one capability of the Bird SMS API: sending, numbers, two-way inbound, routing, and analytics ship with it.