IMEI stands for International Mobile Station Equipment Identities number.
EIR stands for Equipment Identity Registry. It is part of Network Switching System in GSM system.
These two terms have become important as the security threat in India is increasing. The Chinese Mobile Phones do not have these numbers or have all zeroes. This make it difficult to identify the exact identity of the device to make a call.
Sources to be to be used: http://www.hindu.com/thehindu/holnus/002200812231606.htm
Wikipedia Article for IMEI
Wikipedia Article for NSS and EIR:http://en.wikipedia.org/wiki/Network_Switching_Subsystem
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