Related terms

• SIM Box Detection
• Pending SMS
• Undelivered SMS

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SIM Box

SIM Boxes, also known as SIM Farms, are one of the possible routes for sending SMS messages massively. However, they are one of the worst options within the so-called grey routes.

SIM Boxes are boxes that can store up to 100 SIM cards at a time to send messages massively. To do so at a reduced cost, the cards are connected to the lines of different operators and even different countries. These cards, often prepaid or free, use low-cost rates to send SMS at the lowest possible cost. This affects the quality of the messages, and sending through a SIM Box can result in a high percentage of undelivered messages.