Equipment Identity Register (EIR)
The Equipment Identity Register is a database employed within mobile networks. The database holds records for 4 types of mobile; namely Black, Grey, White and “Unknown”. EIR provides an additional level of security which is performed on the mobile equipment itself, as opposed to the mobile subscriber. When a mobile requests services from the network its IMEI (International Mobile Equipment Identity) may be checked against the EIR, to assess which category of mobile it falls under