Toll-free numbers (800, 888, 877, 866, 855, 844, 833) are pre-approved for SMS — but only at low volume to most carriers and almost never to T-Mobile without verification. Verifying upgrades your number to full delivery rights.
Who needs to verify
- Any practice planning to send appointment reminders, confirmations, or message replies from a toll-free number.
- Any practice that's noticed reminders aren't arriving for some patients (often T-Mobile customers).
If you only use the toll-free number for voice calls, you don't need to verify.
What you'll need before starting
| Item | Example |
|---|---|
| Business name (matches your legal entity) | "Sunny Dental, PLLC" |
| Business website | https://sunnydental.com (must be live and reachable) |
| Use case | Appointment reminders and customer care |
| Sample messages (2–3) | "Hi {{patientName}}, this is a reminder about your appointment Tuesday at 2pm. Reply YES to confirm." |
| Opt-in description | How patients agreed to receive SMS (e.g., checkbox on booking form, signed intake) |
| Opt-in proof URL | Screenshot or live URL showing the consent language |
| Estimated monthly volume | A reasonable upper bound — 5,000 messages/mo is typical for a single practice |
| Contact email & phone | A monitored address; the verifier may reply with questions |
Submit verification
- Settings → Phone Numbers → click your toll-free number.
- Click Verify for SMS.
- Fill in each field. The opt-in description is the most-rejected section — be specific.
- Submit.
What "opt-in" really means
Carriers want clear evidence that patients agreed to receive SMS — not just that they gave you a phone number.
Good opt-in language (use something like this on your booking form, intake form, or appointment confirmation page):
By providing your mobile number, you agree to receive appointment reminders and other transactional text messages from {{practice_name}}. Message and data rates may apply. Reply STOP to opt out at any time. Reply HELP for help.
If your form doesn't currently say this, add it before submitting verification.
Timeline
| Day | What happens |
|---|---|
| Day 0 | You submit |
| Day 1–2 | Initial review |
| Day 3–5 | Approval — or a request for more info |
| Day 5+ | Resubmit if rejected; usually resolved within 1–2 days |
You'll get an email notification when status changes. The number's badge in Settings → Phone Numbers updates to Verified when approved.
Why verification gets rejected
| Reason | Fix |
|---|---|
| Opt-in description too vague | Quote the exact consent language and link to where it appears |
| Sample messages look promotional | Stick to transactional: reminders, confirmations, replies — never broadcasts to lists |
| Website unreachable | Make sure SSL is valid and the site loads in a standard browser |
| Business name doesn't match | Match your verified business name exactly (no DBAs unless registered) |
| Volume estimate too high | Start conservative (≤5,000/mo) — you can request an increase later |
After verification
- Delivery rates climb to ~98% across all major US carriers.
- You can monitor delivery in Calls & SMS → Messages → Delivery report.
- If delivery drops below ~70% (especially to T-Mobile), the carrier may revoke verification. Don't blast lists or promotional content — that's what triggers revocation.
What's next
- A2P 10DLC registration (for local numbers)
- Send and receive SMS
- SMS not delivering