ATIS committees and forums have migrated from the Contribution Registration Database (CRD) and website document posting to ATIS Workspace. Therefore, effective May 22, 2014, documents must be uploaded to ATIS Workspace.  For a period of time, documents will continue to be maintained by staff via the CRD and webpages; however, the systems will not be synchronized daily and all participants must use ATIS Workspace for all of their committee/forum needs (documents, calendar, ballots, email, etc.).

Welcome to the International Mobile Subscriber Identity (IMSI) Oversight Council

The IOC is an open industry committee of telecommunications companies and other organizations with a direct interest in the management of IMSI codes. An IMSI is a 15-digit number used within mobile phones that allows service operators to identify mobile terminals, for purposes of international roaming. The IOC is responsible for overseeing the management of IMSI codes that have been assigned to the United States and its possessions as authorized by the U.S. Department of State since 1996.



--General Information-
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Connie Hartman

IOC Committee Administrator:
Drew Greco, ATIS

John Curreri

ATIS Manager:
Jackie Voss


- -Important Information -


The IOC is responsible for the management and administration of International Mobile Subscriber Identities (IMSI) in the United States and maintains compliance with the "IMSI Assignment Guidelines and Procedures" to ensure that it meets the evolving needs of the U.S. wireless telecommunications industry.

Guidelines and Procedures

IMSI Guidelines Version 15.0, (clean)

IMSI Guidelines Version 15.0, (revmarked)