SIM box fraud vs OTT bypass
International termination fees make bypass fraud attractive. SIM boxes terminate international calls as local mobile-originated calls using banks of SIMs. OTT bypass routes calls into consumer OTT apps for the last mile, avoiding termination charges entirely.
| Attribute | SIM box fraud | OTT bypass |
|---|---|---|
| Vector | Physical SIM box appliance | OTT app callback / VoIP |
| Detected via | CDR anomaly, test calls, SIM behavior | Signalling and app-layer inspection |
| Loss surface | Termination fees + roaming | Termination fees |
| Countermeasure | Test calls, SIM-behavior profiling | Difficult — legitimate OTT looks similar |
| Regulator posture | Illegal in most jurisdictions | Legal ambiguity |
Verdict
SIM boxes are the older, more prosecutable vector. OTT bypass is harder to detect and harder to litigate — regulators disagree on whether it is fraud at all. Anti-fraud programs need both a CDR track and a signaling-plus-app track.