Key Takeaways
- MCP rate limits and safety are OEM radio ceilings, carrier fair-use, and plan device/volume caps — not filter evasion.
- Starter, Professional, and Business list Unlimited SMS as platform send volume; that is not unmetered carrier SMS. or “remove Android SMS limits.” Raise OEM settings only where the vendor documents it; operators still meter airtime.
- Free/Developer pause at published SMS allowances. Starter still meters devices.
- Agent safety is allowlisted destinations, send_canary vs send_bulk, and no OTP in the transcript.
- You bring the Android and operator credit. We meter devices plus send volume.
MCP Server for Android SMS Gateway: MCP rate limits and safety — failure modes is what breaks when an agent treats SMS like unbounded tokens. Error handling · list_devices. REST: Developer Center. Spec: MCP.
Devices and send volume. Not a first-party plugin.
OEM · carrier · plan
Three meters. MCP is not a fourth that deletes the others.
Three ceilings, none of them “filters”
Android/OEM SMS rate ceilings, operator fair-use, platform allowance. This article does not teach evasion, “removing limits,” or spam tooling. Industry messaging practices: CTIA. OEM app standby: App standby.
If the prompt is “make it send faster than the phone allows,” the answer is another device — not a clever tool.
Safety failure table
| Failure | Cause | Safe response |
|---|---|---|
| Sends stall mid-burst | OEM ceiling / Doze | Pace jobs; spare phone; not a bypass |
| Tool 4xx at cap | Free/Developer allowance | Upgrade; On Free and Developer, sending pauses when you use the plan SMS allowance rather than silently billing aggregator-style overage. Upgrade or request a custom allowance to continue. |
| Agent loops send | No allowlist / no gate | send_canary only until a human |
| OTP in the chat | Tool returned digits | Return id only; hash at rest |
| Campaign on OTP SIM | One deviceIds | Starter 2 devices isolate |
OEM rate ceilings
Documented vendor settings may raise a ceiling. They do not make operator SMS unmetered and they are not “unlimited SMS.” OEM background restrictions.
Plan SMS and device caps
Free is 300 SMS lifetime. Developer is 25,000 SMS per year. Starter and above uncap platform send volume but still meter devices; carrier fair-use remains. Free plan model.
Tool allowlists and human gates
Split canary vs bulk. Hash destinations in logs. MCP audit · Cursor setup. OTP: OTP use case.
Next steps
Cap the canary tool to one staff MSISDN. Prove DLR. Then decide if bulk exists at all. Install the Android app.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
- Android SMS gateway product guideDefinition, product, and how to buy
- download the Android gateway appGet the APK
