A SIM bank, also known as a SIM box, is a device that manages and utilizes multiple SIM cards in one place. It connects these SIM cards to a VoIP (Voice over Internet Protocol) gateway, allowing them to transmit calls and SMS messages over the internet at significantly lower costs compared to traditional mobile networks.

Here's how a SIM bank works:


  • SIM cards: The SIM bank holds multiple SIM cards, usually from different mobile operators. This allows the operator to leverage various rates and promotions offered by each provider.
  • SIM bank: This device houses the SIM cards and connects them physically to the VoIP gateway.
  • VoIP gateway: This device converts voice calls and SMS messages into digital data packets that can be transmitted over the internet.


1. Call Routing: When a call is received via the VoIP gateway, it is routed to one of the available SIM cards in the bank.

2. SIM Switching: The SIM bank can automatically switch between SIM cards based on various factors like call duration, time of day, or even the simulated location of the SIM card.

3. Cost Optimization: By utilizing multiple SIM cards and routing calls through the internet, SIM banks significantly reduce call costs compared to traditional mobile networks.

4. Virtual Presence: SIM banks can create the illusion that a mobile device is moving by switching SIM cards and simulating location changes. This can be beneficial for applications like mobile marketing or bypassing international roaming charges.


  • Cost-effective: SIM banks can significantly reduce call and SMS costs, especially for international calls.
  • Flexibility: The ability to use multiple SIM cards and switch between them provides greater flexibility and control over communication costs.
  • Scalability: SIM banks can be easily scaled to accommodate a large number of SIM cards and users.
  • Virtual Presence: SIM banks can create a virtual presence for mobile devices, which can be beneficial for certain applications.

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