SMS invites deliver your signing link straight to a recipient’s phone, cutting through crowded inboxes and speeding turnarounds—especially for contractors, field staff, patients, and customers who live on mobile. Use it when you don’t have a reliable email, when emails bounce, or when you need a fast, day-of signature (deliveries, check-ins, work orders, consents).

For best results, include your company name and a short purpose in the invite message to build trust (“Acme—NDA for today’s call”). Set a realistic expiration and reminders to keep momentum, and verify phone numbers (country code included) before sending. If your policy requires an email record, send both SMS and email; the signing experience is the same, and all actions remain audit-ready.

Signers will receive a text message from the following Twilio numbers: +1 (888) 557-6250 or +1 (888) 806-1117 (for a reminder).

SMS invite can be sent to multiple signers via the same phone number. If the document needs to be signed by different individuals using the same mobile number, they will receive a text message with different links to open the document so that they can sign their own copy.

When you customize your invite on the Invite Page, click on the envelope icon near the recipient’s email address. In the dropdown, select SMS. The email address field will change to the phone number field.

When you send a document via SMS, here is exactly what happens on the recipient's side.

Step 1 — Welcome message and signing invitation

The recipient first gets a one-time welcome message from SignNow, followed immediately by the signing invitation with your name and a link to the document. Every message includes opt-out instructions.
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Step 2 — Consent before the document opens

When the recipient taps the link, a consent screen appears before any document content is visible. The recipient must explicitly choose Agree or Decline — nothing is pre-selected. The screen links to the SignNow Terms of Service and Privacy Policy. The document only opens after the recipient selects Agree.

Step 3 — If the recipient declines

If the recipient selects Decline, the document stays hidden and no further text messages are sent. The recipient can change their mind at any time using the Opt In button on the same screen.

SMS invites are available for the following countries: