SIM farm
A SIM farm is a bank of modems holding hundreds of physical SIM cards, used to receive or send SMS on those numbers automatically.
In detail
It is one of the ways numbers reach a marketplace; the other common route is a direct arrangement with an operator. Farms are cheap to run and easy for a carrier to spot, because hundreds of SIMs on one cell site with no voice traffic is a distinctive pattern. Ranges sourced that way tend to be flagged sooner, which shows up later as a delivery rate that falls away within weeks.
Also known as
- sim box
- gsm gateway
- modem bank
Related terms
- Operator poolAn operator pool is the set of live mobile ranges a provider can currently draw numbers from, across the operators it has agreements with.
- SIM registrationSIM registration is the legal requirement in many countries to tie every mobile number to a verified identity document before it can be used.