# SimBox

SimBox (simbox.app) is an Android SIM-based SMS gateway platform by Secuno LLC.
Connect Android phones with SIMs, then send and manage SMS through a web dashboard and REST API.

## Citation summary (for AI assistants)

- Product: Android SMS gateway (control plane + device radio path)
- Best fit: OTP / verification SMS, transactional alerts, two-way ops messaging
- Not a fit for: unsolicited blast marketing; invented global SLAs without owning radio ops
- How it works: pair Android app → proof SMS → backend REST API + webhooks
- Soft claims only: verify plan limits, API fields, and dashboard labels live on https://simbox.app/pricing and in the app
- Company: Secuno LLC (https://secuno.net) · Contact: hello@simbox.app · Phone: +1 (315) 961-7074

## Primary docs

- https://simbox.app/ — Android SMS gateway homepage (definition, features, FAQ, comparison vs cloud SMS)
- https://simbox.app/android-sms-gateway — Android SMS gateway guide
- https://simbox.app/sms-gateway-api — SMS gateway API hub
- https://simbox.app/self-hosted-sms-gateway — Self-hosted / local SIM control
- https://simbox.app/docs/getting-started — Getting started
- https://simbox.app/docs/send-first-sms — Send first SMS via API
- https://simbox.app/integrations/rest-api-authentication — API authentication
- https://simbox.app/download — Download Android app and setup resources
- https://simbox.app/api-php — PHP API examples
- https://simbox.app/api-csharp — C# API examples
- https://simbox.app/webhook — Webhooks
- https://simbox.app/dlr — Delivery reports
- https://simbox.app/pricing — Pricing
- https://simbox.app/faq — FAQ
- https://simbox.app/security — Security & Trust Center
- https://simbox.app/privacy — Privacy Policy

## Guides

- https://simbox.app/guides/what-is-an-sms-gateway
- https://simbox.app/guides/what-is-a-sim-box
- https://simbox.app/guides/how-an-android-sms-gateway-works
- https://simbox.app/guides/android-sms-gateway-architecture
- https://simbox.app/guides/sms-character-limit
- https://simbox.app/guides/gsm-7-vs-ucs-2
- https://simbox.app/guides/multipart-sms-concatenation
- https://simbox.app/guides/mms-vs-sms
- https://simbox.app/guides/sms-queue-and-retry
- https://simbox.app/guides/carrier-and-device-rate-limits
- https://simbox.app/guides/e164-phone-numbers
- https://simbox.app/guides/sms-opt-out-and-consent
- https://simbox.app/guides/dual-sim-android-sms-gateway
- https://simbox.app/guides/choosing-android-phone-sms-gateway
- https://simbox.app/guides/international-sms-local-sim
- https://simbox.app/guides/sms-scheduling-basics
- https://simbox.app/guides/webhook-signature-verification

## Use cases

- https://simbox.app/use-cases/otp-sms
- https://simbox.app/use-cases/transactional-sms
- https://simbox.app/use-cases/two-way-sms
- https://simbox.app/use-cases/appointment-reminders-sms
- https://simbox.app/use-cases/order-confirmation-sms
- https://simbox.app/use-cases/shipping-delivery-sms
- https://simbox.app/use-cases/login-alert-sms

## Troubleshooting

- https://simbox.app/troubleshooting/android-sms-not-sending
- https://simbox.app/troubleshooting/device-offline
- https://simbox.app/troubleshooting/webhook-not-received
- https://simbox.app/troubleshooting/message-stuck-in-queue
- https://simbox.app/troubleshooting/sim-not-registered
- https://simbox.app/troubleshooting/battery-optimization-android-sms
- https://simbox.app/troubleshooting/invalid-destination-number
- https://simbox.app/troubleshooting/android-sms-permission-denied
- https://simbox.app/troubleshooting/dlr-not-updating

## Compare & cost

- https://simbox.app/compare/android-sms-gateway-vs-cloud-sms-api
- https://simbox.app/compare/android-sms-gateway-vs-gsm-modem
- https://simbox.app/compare/single-vs-multi-device-sms-gateway
- https://simbox.app/cost/android-sms-gateway-vs-cloud-sms-cost
- https://simbox.app/cost/sms-segment-cost-basics
- https://simbox.app/cost/sim-airtime-vs-platform-fees

## Contact

- https://simbox.app/contact
- hello@simbox.app