Key Takeaways
- Compliance checklist for phone SMS + MMS: a subscriber MSISDN sending slides is not a rented MMS short code, and OTP still belongs on short SMS.
- Host small HTTPS assets. Do not point the handset at a 40 MB camera dump.
- STOP/suppression must cover MMS promo too.
- Hub L: phone-as-gateway. Product: MMS gateway feature.
- Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Operator MMS tariffs are yours.
- Not legal advice. Developer Center owns live attachment fields.
Hub L checklist: sms gateway use your android phone as sms mms gateway checklist. Product: MMS gateway. Ops: MMS attachments best practices. App sibling: Android app compliance checklist. Phone-as-gateway hub: phone as SMS gateway.
Priced by devices and SMS send volume. You use your own phone and operator SMS credit.
A flyer in a slide is still a flyer. Calling it “transactional MMS” does not make the STOP key optional.
SMS and MMS are different consent machines
Recipients see your real number either way. MMS also needs the handset to fetch a file. Some plans block MMS entirely. Do not assume last quarter’s SMS opt-in covers a weekend of images.
Never put codes in MMS
Login stays GSM-sized SMS with expiry in your app. OTP verification.
Go / no-go table
| Traffic | SMS | MMS |
|---|---|---|
| Login / 2FA | Go | No-go |
| Order photo / field job | Link often enough | Go if SIM MMS works and file is small |
| Promo flyer | Consent + STOP | Same, plus MMS-capable destinations |
| Purchased list | No-go | No-go |
| Huge camera original | — | No-go; host a thumbnail |
Size, fetch, and operator tariffs
The phone pulls HTTPS. Roaming and Wi-Fi-only devices fail silently. Live type / attachment fields: Developer Center, not this blog.
STOP still applies to picture messages
Keyword handling: auto-reply and STOP. US promo context: USA bulk consent.
App checklist is the sibling, not a duplicate
Pairing, OEM, official APK live on the Android app checklist. This page is the message class (SMS vs MMS).
MMS is rarely “just another SMS” on the bill
Priced by devices and SMS send volume. You use your own phone and operator SMS credit. Many operators tariff MMS separately. Free 300 lifetime is a platform SMS cap — do not treat it as unlimited picture messages.
Checklist
- OTP on SMS only.
- MMS SIM actually delivers a staff photo.
- Asset HTTPS, small, boring.
- Consent matches pictures, not only last SMS.
- STOP covers MMS promo.
- No purchased lists.
- Tariff checked with the operator.
- Developer Center for live fields.
- Field-service use named, not “branded OTP.”
- No Unlimited SMS title.
Next steps
Read MMS gateway and pricing. The slide is optional. The SIM and the statute are not.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- MMS gateway on your own SIMMultimedia where supported
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
- Security and Trust CenterCompliance and posture
