A2P stands for application to person, which simply means texts sent from software rather than a personal phone. 10DLC refers to the standard local phone numbers businesses use. Carriers like AT&T, Verizon, and T-Mobile now require every business to register its brand and its messaging before they will reliably deliver these texts.
Registering is what keeps your messages from being filtered, throttled, or blocked. Unregistered texting gets quietly dropped more and more, so this step protects your ability to reach people at all.
What to gather before you start
Have these ready so you can finish in one sitting:
- Your legal business name, exactly as registered.
- Your EIN, the federal tax ID for your business.
- Your registered business address.
- A business website or social profile that matches the name.
- Proof of how people opt in to your texts, for example a screenshot of a form with a consent checkbox.
- Two or three sample messages you actually plan to send.
A sole proprietor without an EIN can still register, but having an EIN makes approval smoother and raises your sending limits.
Where to register
The whole process happens in one place:
- Open Settings.
- Go to Phone Numbers.
- Open the Trust Center.
From the Trust Center you register your brand first, then create a campaign that describes the kind of messages you send. Follow the prompts in order and submit.
How to avoid a rejection
Most rejections come from a few avoidable mistakes:
- Business name or address that does not match official records. Copy them exactly.
- An EIN that does not match the legal name on file with the IRS.
- A missing or weak opt in description. Be specific about how people agree to receive texts.
- Sample messages with no business name or no way to opt out. Include your name and STOP language.
- A website that does not mention the business or has no privacy policy.
If you are rejected, the system usually tells you why. Fix that one item and resubmit.
How long it takes
Brand registration is often quick, sometimes within a day. Campaign approval can take longer, from a couple of days up to a week or two depending on the carriers. Register well before any launch so approval is not what holds you up.
Before you send a single text
A2P registration goes hand in hand with sending texts responsibly. Read the SMS Compliance Checklist for consent, STOP handling, and timing, so your messages stay both approved and welcome.
This guide is practical guidance, not legal advice. Check your own obligations as well.