Key Takeaways
- OTP launch checklist for phone SMS/MMS: prove SMS canary first; treat MMS as a separate lane.
- Free: 1 device / 300 SMS lifetime / 300 contacts.
- Login OTP stays short GSM-7 SMS. MMS needs APN/data and different billing.
- You bring Android, SMS credit, and any MMS data plan. Platform pricing is devices plus send volume.
- Confirm fields in Developer Center.
otp launch checklist for phone sms mms separates auth text from attachments. Hub: Phone as SMS gateway. MMS glossary: What is MMS. Pre-launch: SMS/MMS pre-launch. Live JSON: Developer Center.
Free: 1/300/300. Devices and send volume.
OTP SMS · MMS lane
login code · GSM-7
receipt image · separate canary
OTP is SMS; MMS is optional
Do not block login on attachment APN failures. OTP.
If your OTP “launch” requires MMS to work, you added a failure mode login did not need.
SMS/MMS OTP launch gates
| Gate | SMS OTP | MMS |
|---|---|---|
| Required for login? | Yes | No |
| Canary | Staff code delivered | Optional attachment open |
| Device | Quiet OTP SIM | Never share OTP SIM |
| Billing | SMS airtime | MMS/data plan |
| Doze | Must pass | Must pass if used |
Do not OTP over MMS
Keep promo off the OTP SIM
Phone-as-gateway OTP checklist. Messaging practices.
Next steps
Green the SMS OTP row first. Spend 300 lifetime SMS on canaries — then fund both SMS and any MMS costs.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- OTP and 2FA SMS on AndroidAuthentication flows
- MMS gateway on your own SIMMultimedia where supported
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
