Key Takeaways
- Open-source / GitHub OTP templates for an Android SMS gateway should be brand + digits + expiry — no emoji, no promo footer, no STOP on login.
- We are not that random GitHub listing. Do not chase nulled or “cracked” gateway repos. Use official Downloads + REST.
- Stay GSM-7 when you can. A curly quote in a README sample flips UCS-2 and looks like spam.
- Keep sample templates out of git with real codes. Render in your backend. Confirm the text field in Developer Center.
- You bring the Android and carrier credit. Platform pricing is devices plus send volume.
android sms gateway open source how to design otp templates is copy in your repo, not a modem setting. Hub: Open source / GitHub gateway. Core sibling: core OTP templates. OTP product: OTP. Live JSON: Developer Center.
You bring the phone and airtime. Devices and send volume. Install from Downloads— not a random fork.
README · GSM-7 · no live codes
Your code is 4821 🎉 FREE LOGIN
That sample is how a fork earns a carrier filter.
Templates, not a GitHub clone war
Contrast OSS self-host vs this SaaS control plane honestly. Do not document piracy. OSS OTP in depth. Laravel wording: spammy wording.
If the example in README.md still has yesterday’s six digits, you do not have a template — you have a leak.
OTP template table
| Piece | In git | At send |
|---|---|---|
| Brand prefix | ASCII constant | Same |
| Code | Placeholder only | Hash in store, digits in SMS |
| TTL copy | “expires in N min” | Match cache TTL |
| Emoji / curly quotes | Reject in CI | UCS-2 parts |
| STOP / URLs | Not on OTP | Promo repo, other SIM |
GSM-7 survives forks
Localize in the app, not the radio. Localize language. Retriever is the receiving app (SMS Retriever).
Do not commit the code
Keys in env. env. Log retention: retention pattern. Messaging practices.
Next steps
CI grep for emoji in OTP strings. Canary GSM-7 vs UCS-2. Spend 300 lifetime SMS proving the template — then a funded SIM.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- OTP and 2FA SMS on AndroidAuthentication flows
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
- Android SMS gateway product guideDefinition, product, and how to buy
