FBI CELLULAR ANALYSIS SURVEY TEAM

HISTORICAL MOBILE DEVICE LOCATION ANALYSIS

Intellectual property of the FBI Cellular Analysis Survey Team. Reproduction in whole or in part is prohibited.

SA Jeremy Bauer

FBI Chicago

Trial Report

Telephone Number Analyzed

(630) 660-0402

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4/30/2021

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 1 of 15 PageID #:381
INTRODUCTION

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1. Background

The Federal Bureau of Investigation (FBI) Cellular Analysis Survey Team (CAST) was requested by SA Shanna Saunders to 

analyze cell phone records for (630) 660-0402. The cell phone was believed to be associated with a bank robbery which 

occurred on July 11, 2020 at approximately 11:00 AM at Glen Ellyn Bank and Trust, 357 Roosevelt Road, Glen Ellyn, IL. 

An additional pertinent address was also provided. 

2. Methodology

An analysis was performed on the call detail records obtained for the cell phone. The call detail records documented 

the network interaction to and from the cell phone. Additionally, the records documented the cell tower and cell sector 

(“cell site”) which served the cell phone during this activity. Used in conjunction, the call detail records and a list of cell

site locations illustrate an approximate location of the cell phone when contact was initiated with the network. 

2.1 Cell Site Locations

Cell sites in existence during the time of the incident were input into mapping software using latitude/longitude 

coordinates of the cell sites provided by the service provider. The cell sites associated with the target cell phone were 

located utilizing the mapping software and the plotted cell site data. T-Mobile also provided Timing Advance data which 

shows an approximate distance from the tower for the cell phone, as measured by the network. 

3. Conclusions

A historical cell site analysis was performed on the call detail records for the cell phone. The methods detailed in 

Sections 2 and 2.1 were used to produce the attached historical cell site analysis maps. All times on the following maps 

are displayed in Central Time.

Intellectual property of the FBI Cellular Analysis Survey Team. Reproduction in whole or in part is prohibited.

DRAFT

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 2 of 15 PageID #:382
SECTOR ILLUSTRATION

N

S

W E

• Active sectors are 

displayed as a wedge 

with a shaded arc

• The shaded arc solely 

indicates the general 

direction of the radio 

frequency signal 

• The sector orientation 

can vary by cell site and 

service provider

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Intellectual property of the FBI Cellular Analysis Survey Team. Reproduction in whole or in part is prohibited.

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Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 3 of 15 PageID #:383
TIMING ADVANCE

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• A roundtrip network 

measurement from tower 

to device and back as 

provided by T-Mobile.

• When displayed on a map, 

a Timing Advance 

illustration shows an 

approximate distance from 

the tower for the phone. 

Intellectual property of the FBI Cellular Analysis Survey Team. Reproduction in whole or in part is prohibited.

DRAFT

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 4 of 15 PageID #:384
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Map depicting the T-Mobile towers (green dots) in the area and the addresses provided as 

pertinent to the investigation. 

Legend

DRAFT

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 5 of 15 PageID #:385
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Map depicting the cell sites used by (630) 660-0402 on July 9, 2020. The records are consistent 

with southbound travel.

Legend

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

CID 102076-63

11:08:16 AM; Voice

CID 23853-13

8:35:53 PM; Voice

Note: Not all times of usage are displayed.

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Map depicting the times on July 10, 2020 during which (630) 660-0402 used tower 24073. 

Legend

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

CIDs 24073-12, 24073-13

2:47:51 PM; Voice

2:51:09 PM; Voice

2:52:49 PM; Voice Mail

3:18:12 PM; Voice

3:18:53 PM; Voice

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Map depicting the cell sites used by (630) 660-0402 on July 11, 2020 from 12:00 AM to 11:00 AM. 

CID 23869-1

1:23:15 AM; Voice

1:24:50 AM; Voice

1:26:14 AM; Voice

1:26:30 AM; Voice

1:27:13 AM; Voice

CID 23936-5

3:48:52 AM; Voice

3:49:17 AM; Voice

3:49:29 AM; Voice

3:49:46 AM; Voice

3:49:56 AM; Voice

3:50:06 AM; Voice

CID 24073-3

10:46:43 AM; Voice Mail

Legend

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Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 8 of 15 PageID #:388
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Map depicting the cell site used by (630) 660-0402 on July 11, 2020 at 10:46 AM. 

Legend

CID 24073-3

10:46:43 AM; Voice Mail

DRAFT

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 9 of 15 PageID #:389
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Map depicting the measured distance from the tower for (630) 660-0402 on July 11, 2020 from 

10:55 AM to 11:13 AM.

CID 24073-3

10:55:14 AM to 11:02:21 AM

6 Measurements

0.39 Miles

Legend

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Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

CID 24315-5

11:12:12 AM to 11:12:54 AM

3 Measurements

0.44 – 0.48 Miles

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Call detail records from July 11, 2020 from 3:50 AM to 11:21 AM (CDT). The records show no 

outgoing call or SMS activity between 3:50 AM and 11:12 AM (CDT). 

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

DRAFT

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 11 of 15 PageID #:391
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Map depicting the cell site used by (630) 660-0402 on July 11, 2020 at 11:21 AM. 

CID 24315-16

11:21:58 AM; Voice

Legend

DRAFT

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 12 of 15 PageID #:392
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Map depicting the cell sites used by (630) 660-0402 on July 11, 2020 from 11:00 AM to 11:59 PM. 

CIDs 23884-2, 23884-11

2:06:31 PM; Voice

2:13:48 PM; Voice

2:14:21 PM; Voice

2:14:36 PM; Voice

8:43:33 PM; Voice

9:11:08 PM; Voice Mail

9:11:48 PM; Voice Mail

9:22:35 PM; Voice

CID 23866-1

1:00:49 PM; Voice

CID 23861-23

9:16:21 PM; Voice

CID 23827-2

11:36:51 PM; Voice

CID 20982-13

9:59:11 PM; Voice

CID 24315-16

11:21:58 AM; Voice

Legend

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Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

Case: 1:20-cr-00369 Document #: 58-3 Filed: 05/28/21 Page 13 of 15 PageID #:393
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Map depicting the cell sites used by (630) 660-0402 on July 12, 2020. The records are consistent 

with northbound travel.

Legend

Intellectual property of the FBI Cellular Analysis 

Survey Team. Reproduction in whole or in part is 

prohibited.

CID 27671-2

11:12:50 AM; Voice

CID 23943-1

7:41:56 AM; Voice

7:42:49 AM; Voice

Note: Not all times of usage are displayed.

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END OF REPORT

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