Central Equipment Identity Register
A Central Equipment Identity Register is a database of the IMEI numbers of blacklisted handsets. If a device's ESN or IMEI number is listed on a CEIR, it is not supposed to work on member service providers' networks; only paying members may access the database. 
A common usage of a CEIR is with stolen cellphones. Once a user reports to their operator about the theft, the cell phone's IMEI number should go to CEIR, supposedly making the device unusable in any network (although this does not always work). A key reason this often does not work is that while many operators from many countries contribute IMEIs to the CEIR, each also have a unique profile that determines which operators' blocks will be included on the CEIR updates received by each operator. The UK networks for example do not receive those block records originated by non-UK networks. Annual fees are required for access to the CEIR, and access is tightly regulated Contributing operators decide for themselves which handsets they will block from their own networks.
Currently, the Central Equipment Identity Register is more frequently called an IMEI DB (database) system which means that it is a central system for network operators (those that have an EIR) to share their individual blacklists with one another so that service is denied for the particular devices that appear on that blacklist. The idea is for network operators to compile one global blacklist through the IMEI DB. However, there is no agreement on a single CEIR.
An equipment identity register reduces the threats of theft of handsets by enabling individual operators to prevent the use of stolen handsets in their own networks. This improves users' security by switching off stolen phones, making them useless (bricked) for mobile phone thieves and thus less likely to be stolen in the first place. As the number of mobile devices and messaging users continue to grow, they become a target for fraudulent and criminal activities. Mobile Messaging application and infrastructure companies such as Airwide Solutions and Tekelec are examples of providers for Equipment Identity for worldwide mobile operators like Vodafone (Airwide) and Cegetel (Tekelec) that deploy the lists for the CEIRs.
- The IMEI article has this relatively detailed CEIR/blocklist section.
- "IMEI Database 3rd Party Access Restricted Usage Agreement by Paul.DOC". Retrieved 30 September 2013.
- "Privacy & Security Statement". Archived from the original on 30 September 2013. Retrieved 30 September 2013. "CNO users are free to decide their own policies for blacklisting handsets on their local EIR blacklists"
- IMEI DB — official site (previously known as the Central Equipment Identity Register)
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