Key Takeaways
- Core Android SMS gateway STOP handling is: receive on the SIM, record the MSISDN, never promo that number again.
- Do not rewrite the Android-app STOP how-to; that is permissions. This is product-level suppression.
- Honor STOP, UNSTOP if you publish it, and local equivalents you advertised.
- The device must stay online or opt-outs queue in the modem and you keep blasting.
- This is not legal advice. Counsel owns TCPA/PECR and local rules.
- You bring the phone and operator credit. We meter devices and send volume.
STOP is inbound on your SIM
Core Android SMS gateway how to handle STOP and opt-outs: the recipient texts the MSISDN that blasted them. That SMS lands on the paired phone. Your job is to read it, suppress the list, and stay quiet. A footer that says STOP without an inbox path is decoration.
Product: auto-reply and STOP. Two-way: two-way SMS. Do not treat this as a second homepage for how the gateway works.
“If you cannot show the suppress row, you did not honor STOP. You only printed the word.”
App how-to is a different spoke
Notification access and default SMS role live on how to handle STOP (app). Link it. Core product still needs list suppression even when the app is perfect.
What to honor immediately
| Inbound | Action | Not |
|---|---|---|
| STOP / unsubscribe / local word you published | Suppress promo immediately | Wait for a nightly job |
| HELP | Short identity + how to opt out | A marketing drip |
| YES on a reservation | Booking path | Treat as consent for blast |
| OTP paste-back | Ignore or support | Add to promo |
| Abuse / legal threat | Escalate; keep sending off | Argue in SMS |
Acceptable use. External: CTIA messaging principles.
Inbox, webhook, suppress
Prefer webhooks over polling. Inbox API, webhook practices. Idempotent suppress — duplicate STOP is normal.
OTP is not an opt-out lane
Isolate login SIMs so a STOP on promo cannot strand 2FA. OTP. Counsel for your market — not a loophole FAQ.
Cost
Confirmation SMS still spend operator credit and platform volume. Device must stay on the plan. Pricing.
Checklist
- Inbound path live on the promo MSISDN.
- Suppress before the next campaign tick.
- App STOP how-to linked for permissions.
- Phone online canary.
- OTP pool disjoint.
Next steps
Auto-reply, setup, segment lists.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- two-way SMS inboxReplies on your SIM
- SMS auto-reply and STOP keywordsOpt-out and keywords
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
