Set up SMS login (carrier registration)

What you'll need

• A Stripe-billed account (SMS/WhatsApp carrier registration is only available on the new billing platform — Recurly accounts should connect their own Twilio account on the Apps page instead)
• 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

1. Go to Account Settings → Messaging (/user/editprofile#messaging).
2. Open the WhatsApp Login Sender card — SMS and WhatsApp share the same underlying carrier registration and managed number.
3. 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) — required before any managed number can send.
4. Enter your business's legal name, tax ID, address, contact email/phone, and vertical when prompted, and submit.
5. 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.

Related articles

• Messaging tab overview
• Buy a managed number for SMS or WhatsApp
• Set up WhatsApp login