Update on ESN Exhaustion and Issues Related to Recovery of

Previously Assigned ESNs

John Derr, Staff Director, Technical Regulatory AffairsESN Administrator, TIA

Gary Pellegrino, Chair TR-45 Ad Hoc ESN/UIM/MEIDCommFlow Resources, Inc.

October 2007

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Electronic Serial Numbers (ESN)- A Finite Resource!

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Exhaustion of Present ESN Resource

As of 2007.09.30, 264 blocks of 250K (262,144) “virgin” (previously unassigned) Electronic Serial Numbers (ESNs) remain, or only 69.2 million

Virgin ESN Exhaust expected early Q1’08 Set manufacturers (MFRs) starting to provision

more Mobile Equipment IDentifiers (MEIDs) but some service providers are still asking for ESN-provisioned handsets

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Recovering Previously Assigned ESNs Complex and often Difficult

Some companies are no longer in business Other recipients are still in business but may

refuse permission to utilize used or unused ESNs

Some companies that still exist are cooperative, but may not know what production range was used– It is difficult finding personnel who have any knowledge of

previous usage of Code ranges—service provider assistance is welcome

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Increased Global Demand for Numbering Resources

Recovery of previously assigned ESNs for suitable re-use is NOT an intermediate-term solution to implementing MEID in mobile stations and/or the Expanded UIM_ID (“E-UIM_ID”) used in Removable User Identity Modules (“R-UIM”)

Increased global demand is outstripping recovery efforts making accelerated service provider implementation of MEID, E-UIM_ID critical

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Technology Use Sometimes Not Correlated with Assignment Date

Some mobile set manufacturers may have assigned entire 8-bit ESN MFR Codes (blocks of 16M, 16,777,216) to each individual production line (in some instances with many blocks unused)

As a result, some ESN Codes assigned in 1990s or even 1980s may have mix of AMPS, TDMA and even CDMA

Sometimes production ranges are not known. Those ranges with no-CDMA use are candidates for UIM_ID derivation

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Timeline of ESN Exhaustion As of 2007.09.30, there are 264 blocks

of 250K serial numbers remaining – 40 blocks remain to be assigned in MFR Code

016– MFR Codes 017 (64 blocks) and 018 (64 blocks)

will be assigned next– Finally, the last virgin blocks in MFR Codes 250

(40 blocks) and 255 (56 blocks) will be assigned at which time the Virgin ESN Pool will be exhausted (expected early Q1’08)

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Timeline of ESN Exhaustion (continued)

After virgin ESN exhaust, assigned code ranges with no known use will be candidates for ESN assignment after a short consultation with North American service providers and clearinghouse and inter-carrier mediation vendors (this consultation process underway now).

“Clear” ranges available after virgin ESN exhaust is expected to be limited

Some ranges thought to be “clear” have shown live subscribers after consultation process and may no longer be suitable candidates

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Timeline of ESN Exhaustion (continued)

ESN Administrator requesting repeat applicants to provision all new mobile set models with MEIDs

At this point in time, ESNs should be used only for existing set models still in production until their “end of life”– This is a prudent approach and helps minimize the

possibility of ESNs exhausting in the middle of the model’s production life

However, the cooperation of service providers in requesting and accepting MEID-provisioned handsets is critical

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ESNs Used for UIM_ID Derivation ESNs have been used for UIM_ID derivation since

September 2001 Of ~385.9M ESNs designated for UIM_IDs

through September 2007 (6 year period); ~156.5M or 40.5% have been designated in first 9 months of 2007 (see graphic on next page)

ESNs designated for UIM_ID derivation in the first 9 months of 2007 (~156.5M) exceeds by 21% the amount (~128.9M) designated for the three previous calendar years, 2004, 2005 and 2006!

Efforts are continuing in earnest to identify and provide additional suitable ESN ranges for UIM_ID derivation

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ESNs Used for UIM_ID Derivation (Accelerating Demand in 2007)

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20,000,000

40,000,000

60,000,000

80,000,000

100,000,000

120,000,000

140,000,000

160,000,000

180,000,000

2004 2005 2006 2007

ESNs

(9 Months)

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ESNs Used for UIM_ID Derivation (Accelerating Demand in 2007)

There have been reports that R-UIM service providers in Asia-Pacific region may be requesting R-UIM suppliers to provide all R-UIMs sufficient to launch a new service prior to “day one” of launch– If this is true, demand for a limited resource is

being further exacerbated and this practice needs to be reviewed

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ESNs Used for UIM_ID Derivation (continued)

ESN Administrator’s monthly report contains additional information concerning recovery of previously assigned ESNs and ESNs designated for UIM_ID derivation. See Section III.

Virgin space assigned (or designated) for UIM_ID Code derivation is presently available to be considered for possible future non-CDMA technology use– The U.S. analog sunset date (February 18, 2008) as planned

by the U.S. Federal Communications Commission (FCC) may not remove obligation to assign an ESN MFR Code to requestors (as some rural U.S. service providers may voluntarily opt to continue analog service).

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ESNs Used for UIM_ID Derivation (continued)

Following Virgin ESN exhaust, efforts to designate AMPS-only and/or TDMA-only code ranges (no CDMA use) for UIM_ID derivation will continue

However, the skyrocketing demand in 2007 for UIM_IDs along with the lack of information regarding ESN Code range technology use still limits the prudent lifetime of UIM_IDs

KDDI has been very helpful in targeting recovery of ESNs from Japanese-domiciled set MFRs to use for UIM_ID derivation. Other service providers are also welcome to provide assistance to the ESN Administrator

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ESNs Used for UIM_ID Derivation (continued)

Demand for ESNs used in mobile stations has been mitigated with increasing assignments and service provider deployments of MEIDs– ~ 92.0M ESNs assigned in first 9 months of 2007– ~134.2M MEIDs assigned in first 9 months of 2007

In like manner, in 2008, the demand for UIM_IDs must also be mitigated by the provisioning and service provider deployments of Expanded UIM_ID (“E-UIM_ID”)

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Reference Information

Information on migration to MEIDs from ESNs may be found (updated on monthly basis) at,

www.tiaonline.org/standards/resources/esn andwww.tiaonline.org/standards/resources/meid

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Acronyms AMPS – Advanced Mobile Phone System E-UIM_ID – Expanded UIM_ID (replacement for UIM_ID) ESN – Electronic Serial Number EUMAG – ESN/UIM/MEID Ad Hoc Group of TR-45 CDMA – Code Division Multiple Access MEID – Mobile Equipment IDentifier (replacement for ESN) MFR – Manufacturer R-UIM – Removable User Identity Module TDMA – Time Division Multiple Access TIA – Telecommunications Industry Association TR-45 – TIA Engineering Committee on Mobile and Personal

Communications Systems Standards UIM – User Identity Module UIM_ID – UIM IDentifier

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Contacts, Information

Further Comments, Inquiries Welcome

Gary Pellegrino, Chair TR-45 EUMAG (gary@commflowresources.com)John Derr, ESN Administrator

(jderr@tiaonline.org)Cheryl J. Blum, Chair TR-45

(cjblum@alcatel-lucent.com)Edward F. Mikoski, Jr.

TIA Vice President, Standards & Business Development (emikoski@tiaonline.org)