Introducing Simdora 10

Ten SIMs.One gateway.Zero missed messages.

A 10-SIM GSM gateway that receives, stores, and delivers SMS to your systems over Ethernet, around the clock.

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Abstract concept render of the Simdora 10 gateway with ten softly lit SIM slots
Concept render

10 SIM cards.One device.

Manage ten independent GSM connections through a single gateway.

  1. 01
  2. 02
  3. 03
  4. 04
  5. 05
  6. 06
  7. 07
  8. 08
  9. 09
  10. 10
  • 10 independent modems.
  • One management interface.
  • Centralized message delivery.

From SIM to server.Automatically.

Simdora receives messages, preserves them, and delivers them directly into your infrastructure.

  1. 01

    Receive

    An SMS arrives on any of the ten SIM cards.

  2. 02

    Store

    The message is stored in a persistent queue on the device's microSD card.

  3. 03

    Deliver

    Simdora sends the message to your configured HTTP/HTTPS endpoints using your preferred payload format.

Your application never has to touch a modem.

Messages should survive interruptions.

Networks fail. Servers restart. Simdora keeps track of what still needs to be delivered.

01

Persistent Message Queue

Messages are stored on microSD and retained across device restarts and network outages.

02

Automatic Delivery Retries

Up to ten delivery attempts with back-off and an optional maximum message age.

03

Duplicate-Delivery Protection

Built-in safeguards help prevent duplicate processing during delivery.

04

Automatic Modem Recovery

Each modem supports individual hardware reset and automatic recovery.

05

Works Without an SD Card

Messages can be delivered directly from the SIM. The source message is deleted only after every configured endpoint has accepted it.

Your messages.Exactly as written.

Unicode support keeps messages readable across languages, scripts, and multi-part deliveries.

  • Full Unicode support
  • Turkish characters and national GSM shift tables
  • Arabic with right-to-left display
  • Emoji
  • Multi-part SMS reassembly
  • Up to 20 SMS parts combined into one message
  • Preserved line breaks
DemoBankFictional sender for demonstration
Part 1/3

DemoBank: تم إيداع مبلغ 1,250.00 QAR في حسابك ****4821

Part 2/3

Ref: TXN-20481 · 14:32 رصيدك المتاح: 8,430.50 QAR

Part 3/3

شكرًا لاستخدامكم خدماتنا 🙏 Thank you for banking with us.

Your infrastructure.Your payload.

Deliver SMS to your applications in precisely the format they expect.

Incoming SMS

Sender
+974XXXXXXXX
SIM
Slot 03
Message
"Payment received."
HTTP request
POST https://api.example.com/sms
Content-Type: application/json

{  "device": "{{device.id}}",  "sim": "{{sim.msisdn}}",  "sender": "{{sms.sender}}",  "message": "{{sms.text}}",  "received_at": "{{sms.received_at}}"}

One example template. Form bodies and fully custom templates are also supported.

  • Up to 12 HTTP/HTTPS endpoints
  • JSON and form request bodies
  • Custom payload templates
  • Dynamic variable tags
  • Basic authentication
  • Bearer authentication
  • Custom HTTP headers
  • Sender filtering using regex
  • Filtering by SIM slot
  • Per-endpoint heartbeat
  • HTTPS validation with built-in root CA bundle
  • Live payload preview
  • Send Test Request
  • Per-message delivery logs
  • Manual resend

Receive. Forward. Send.

SMS-to-SMS Forwarding

Forward incoming messages directly to other mobile numbers.

  • Configure forwarding per SIM
  • Up to three destinations per SIM
  • Original, prefix, or suffix format
  • Keyword filters
  • Sender filters
  • Loop protection

Call Management

Stay informed about incoming calls.

  • Operator-network-configured call forwarding
  • Missed-call notifications

Outbound SMS

Send messages on your schedule.

  • Send individual SMS
  • Bulk jobs of up to 1,000 recipients
  • CSV recipient import
  • Schedule up to one year ahead
  • Distribute sending across SIMs
  • Scheduled messages run when the desktop app is closed

Ethernet first.Wi-Fi when needed.

Connect Simdora to your network and let it handle the communication.

SIMDORA
Your server
Ethernet · Primary
Wi-Fi · Fallback
Active path: Ethernet
  • 10/100 Ethernet using W5500
  • 2.4 GHz Wi-Fi
  • Automatic Wi-Fi fallback
  • Live network switching without restart
  • Setup Wi-Fi network for initial configuration
  • Automatic LAN discovery using mDNS and UDP
  • REST API with a documented contract

Full visibility.Complete control.

Manage ten modems, messages, endpoints, and device settings from one desktop application.

macOSWindows
Simdora — Dashboard
SIM 01
Operator A
+974 •••• 1000
● Registered
SIM 02
Operator B
+974 •••• 1037
● Registered
SIM 03
Operator A
+974 •••• 1074
● Registered
SIM 04
Operator B
+974 •••• 1111
● Registered
SIM 05
Operator A
+974 •••• 1148
● Registered
SIM 06
Operator B
+974 •••• 1185
● Registered
SIM 07
Operator A
+974 •••• 1222
● Registered
SIM 08
Operator B
+974 •••• 1259
● Registered
SIM 09
Operator A
+974 •••• 1296
● Registered
SIM 10
Operator B
+974 •••• 1333
● Registered
Board 41 °C Fan 38%

Conceptual interface — not the final application

The device does the work.The app is just a window.

Update with confidence.

Simdora protects against unsuccessful firmware updates with trial activation and automatic rollback.

v2.0.3
Previous
v2.1.0
New
Trial…
  1. 01The new firmware is installed through OTA.
  2. 02The new version starts in trial mode.
  3. 03The device checks whether the firmware becomes healthy.
  4. 04If health checks fail, Simdora returns to the previous working version.

Rollback reduces risk from a faulty update; it does not eliminate every possible failure.

Engineered for the details.

Hardware

Modems
10
Cellular Network
2G GSM/GPRS, quad-band, LTE
Processor
ESP32 dual-core
Ethernet
10/100 Ethernet, W5500
Wireless
2.4 GHz Wi-Fi
Storage
microSD for SMS archive, delivery records, and logs
Power Input
12 V DC
Modem Power System
Dedicated high-current modem rail
Power Buffering
1,000 µF per modem
Cooling
On-board temperature sensor and controlled fan

Software and Management

Clock
Network/NTP time, UTC internally, configurable display time zone
Desktop Platforms
macOS and Windows
API
REST API
Access Management
Users, roles, and permissions
Firmware
OTA with automatic rollback

Capacity

SIM Slots
10
Long SMS
Up to 20 parts
HTTP/HTTPS Endpoints
Up to 12
SMS Forwarding
Up to 3 destinations per SIM
Bulk SMS
Up to 1,000 recipients per job

Physical Specifications

Dimensions
[To be announced]
Weight
[To be announced]
Enclosure
[To be announced]
Warranty
[To be announced]

Network compatibility notice

Simdora 10 uses 2G/LTE GSM networks. If you are planning to use 2G, please confirm 2G coverage, operator support, and applicable device approval requirements in your country before deployment.

One gateway.Many possibilities.

OTP & 2FA Ingestion

Route incoming verification messages into authorized internal systems.

Banking & Payment Notifications

Capture and process SMS notifications from financial services.

Multi-Number Operations

Centralize messages received across multiple business SIM cards.

Call Centers & Support

Manage incoming SMS and missed-call notifications.

Logistics & Delivery

Forward shipment, courier, and operational messages to internal platforms.

IoT & Monitoring

Convert incoming alarm and device SMS notifications into HTTP webhook events.

Frequently asked questions.

Yes. Message receiving, storage, delivery, forwarding, and scheduled sending run on the gateway itself. The desktop app is for management.

Ready to connect ten SIMs to your stack?

Tell us about your infrastructure. We'll help you evaluate Simdora 10 for your deployment.

Alternative contact

Authorized distributors

Saudi Arabia

Distributor [To be announced]

  • [To be announced]
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Qatar

Distributor [To be announced]

  • [To be announced]
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  • [To be announced]

Türkiye

Distributor [To be announced]

  • [To be announced]
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  • [To be announced]