Electronic Serial Numbers (ESN) and MEID
An electronic serial number (ESN) is the unique identification number embedded or inscribed on the
microchip in a wireless phone by the manufacturer. Each time a call is placed, the ESN is automatically
transmitted to the base station so the wireless carrier's mobile switching office can check the call's validity.
The ESN cannot easily be altered in the field. The ESN differs from the mobile identification number (MIN),
which is the wireless carrier's identifier for a phone in the network. MINs and ESNs can be electronically
checked to help prevent fraud.
Mobile Equipment IDentifiers (MEID)
A Mobile Equipment IDentifier (MEID) is a globally unique 56-bit identification number for a physical
piece of mobile station equipment. Equipment identifiers are "burned" into a device and should be resistant to
modification. They are used as a means to facilitate mobile equipment identification and tracking. Additionally,
MEIDs are coordinated with International Mobile Equipment Identifiers (IMEIs), facilitating global roaming
and harmonization between 3G technologies as a universal mobile equipment identifier.
System Operator Codes for ANSI/TIA/EIA-136
The 12-bit System Operator Code (SOC) is used to identify a Service Provider (SP) and is used along with
the System Identity (SID) by a mobile station to acquire or reject services offered by specific SPs.
SS7 TT & SSN Assignment Notification Information Repository
This repository may be used to enhance industry awareness of previous and proposed assignments
including information for company representatives to contact peers. When questions arise, this repository
provides a tool to resolve potential conflicts and to avoid possible collisions between carriers on
similar services. The tables document known assignments and are not guaranteed to be accurate or up-to-date.
TIA OID (Object IDentifier) Assignment Guidelines and Procedures
These guidelines describe the TIA administration and assignment process for the sub-tree designations below OID
"tia". The American National Standards Institute (ANSI) is the registration authority for the "iso/member-body/us" branch o
f the tree [see section. 8.0]. TIA has registered sub-tree "tia" with ANSI and is the "tia" sub-tree Assignor.
T.35 Code (T- and V-Series) Administration for the United States and Canada
Involving North America (within Region #2) national manufacturers of equipment according to International
Telecommunication Union-Telecommunication Standardization Sector (ITU-T) T-series (Terminals for telematic services)
and V-Series (Data communication over the telephone network) Recommendations.