The main problem facing anyone running a cellular-based business - OTP and password reset, bulk text messaging, Call termination, etc. is SIM blocking by the cellular provider. The constant need to replace Your SIMs become an ever-increasing strain on Your business and eroding Your profit margin. Most Gateways, including the one we're offering, have some simple tricks: Dial the next call out of a random port and not by a pre-configured order, locking to a different BTS, allowing You to give out the impression the Gateway isn't stationary, putting some random delay between two outgoing calls from the same module, etc. In addition to those, the Gateways we provide have several advanced software and hardware mechanisms, some of them unique, designed specifically to address those problems.