What you'll need
- A Stripe-billed account — SMS/WhatsApp carrier registration (the mandatory US carrier vetting of your business before it may send SMS) is only available on the new billing platform
- If your account is billed on Recurly instead, connect your own Twilio account on the Apps page rather than using this flow
- Your business's legal name, EIN/tax ID, business address, a contact email and phone number, and the industry/vertical your business falls under (US carriers require this for SMS brand registration)
Steps
- Go to Account Settings → Messaging (
/user/editprofile#messaging). - Open the WhatsApp Sending Account card — SMS and WhatsApp share the same underlying carrier registration and managed number.
- If managed SMS/WhatsApp isn't set up yet, you'll see a prompt to complete SMS setup before you can search and purchase a managed number. This registers your business with the SMS carriers (brand + campaign registration — carrier terminology, unrelated to MyWiFi campaigns) — required before any managed number can send.
- Enter your business's legal name, tax ID, address, contact email/phone, and vertical when prompted, and submit.
- Registration is reviewed by the carriers, not instantly approved — check back on the Messaging tab for your registration status.
Best practice: use your business's real legal details, exactly as registered with your tax authority. Mismatched details are the most common reason carrier registration gets rejected or delayed.
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