---
title: "SIM box fraud"
description: "SIM box fraud diverts international calls or A2P SMS away from official interconnect routes by terminating them through banks of local SIM cards, so the traffic looks like cheap local person-to-person traffic and the operator loses its international termination revenue."
canonical: "https://omnichannels.ai/glossary/sim-box-fraud/"
language: "en"
updated: "2026-10-10"
publisher: "BroadNet Technologies"
brand: "OmniChannels.ai"
---

# SIM box fraud

Canonical: https://omnichannels.ai/glossary/sim-box-fraud/
Language: en
Publisher: OmniChannels.ai by BroadNet Technologies

**Definition:** SIM box fraud diverts international calls or A2P SMS away from official interconnect routes by terminating them through banks of local SIM cards, so the traffic looks like cheap local person-to-person traffic and the operator loses its international termination revenue.

A SIM box (or GSM gateway) holds many SIM cards. Traffic arrives over the internet and is re-originated from those SIMs onto the mobile network as local calls or texts. The fraudster pays local retail rates while the destination operator loses the higher international or A2P termination fee it would normally charge.

In messaging, the same technique sits behind many grey routes: a business's A2P SMS is delivered from a random local mobile number instead of its registered sender ID. Messages may arrive late, lose their alphanumeric sender, break Arabic encoding, or be blocked when the operator detects the SIMs, and delivery receipts may be unreliable.

For businesses the risks are practical: OTPs that never arrive, customers who distrust messages from unknown numbers, and non-compliance with sender ID registration rules in markets such as the UAE and Saudi Arabia, where promotional and transactional senders must be registered.

Ask providers whether routes are direct to operators or through named aggregators, test delivery with real handsets in each country, and check that the sender ID displayed is the one you registered.