331 Prefixes/Exchanges

The three digits following the area code of a phone number are known as the prefix or exchange. The remaining numbers (last 4 digits of phone number) all refer to that prefix/exhange.

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Prefixes

location/Company

331-200BARTLETT, IL
T-MOBILE USA, INC.
Date Assigned: 2011-07-11
331-201DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2012-01-06
331-202ELMHURST, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2012-01-17
331-203AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2011-10-12
331-205AURORA, IL
T-MOBILE USA, INC.
Date Assigned: 2011-10-21
331-206AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2011-10-12
331-207YORKVILLE, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
Date Assigned: 2011-11-01
331-208AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2011-11-08
331-209ELMHURST, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2012-01-17
331-210ST CHARLES, IL
PEERLESS NETWORK OF ILLINOIS, LLC - IL
Date Assigned: 2012-03-06
331-211

331-212AURORA, IL
MCI WORLDCOM COMMUNICATIONS, INC. - IL
Date Assigned: 2012-04-05
331-213NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2011-09-06
331-217

331-220AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2011-07-12
331-221ELMHURST, IL
AMERITECH ILLINOIS
Date Assigned: 2009-01-21
331-222ST CHARLES, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2008-10-28
331-223ST CHARLES, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2008-10-28
331-224

331-225ELMHURST, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2011-08-22
331-227SUGARGROVE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2011-08-11
331-228ST CHARLES, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2011-09-21
331-248GENEVA, IL
COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
Date Assigned: 2007-07-06
331-256AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2011-09-13
331-262AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2008-07-30
331-309

331-311

331-312

331-330NAPERVILLE, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2008-08-19
331-331

331-332NAPERVILLE, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2008-11-03
331-333NAPERVILLE, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2008-11-03
331-411

331-422ST CHARLES, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
Date Assigned: 2008-11-13
331-425AURORA, IL
T-MOBILE USA, INC.
Date Assigned: 2007-07-11
331-431AURORA, IL
BANDWIDTH.COM CLEC, LLC - IL
Date Assigned: 2010-05-26
331-442ST CHARLES, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2008-10-30
331-444NAPERVILLE, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
Date Assigned: 2010-08-04
331-452AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2007-09-20
331-454AURORA, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2009-05-07
331-456ROSELLE, IL
GLOBALCOM, INC.-IL
Date Assigned: 2007-12-05
331-457NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2008-11-14
331-462LOMBARD, IL
XO ILLINOIS, INC.
Date Assigned: 2008-08-23
331-465W CHICAGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
Date Assigned: 2007-10-17
331-472NAPERVILLE, IL
T-MOBILE USA, INC.
Date Assigned: 2008-10-22
331-481DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2008-10-29
331-511

331-551LOMBARD, IL
DENALI SPECTRUM LICENSE, LLC
Date Assigned: 2008-11-05
331-555

331-575AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2007-09-18
331-588ST CHARLES, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
Date Assigned: 2010-02-15
331-591

331-611

331-618

331-625DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
Date Assigned: 2009-10-16
331-630

331-642ELMHURST, IL
BANDWIDTH.COM CLEC, LLC - IL
331-643AURORA, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2007-09-18
331-645ELMHURST, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2007-11-05
331-684AURORA, IL
SIGECOM, LLC - IL
Date Assigned: 2007-07-12
331-700

331-708

331-711

331-725OSWEGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
331-773

331-777DOWNERSGRV, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
Date Assigned: 2010-09-22
331-779

331-811

331-815

331-825GENEVA, IL
DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. - IL
Date Assigned: 2007-11-08
331-826ELMHURST, IL
SPRINT SPECTRUM L.P.
Date Assigned: 2008-11-18
331-847

331-872

331-888WARRENVL, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
Date Assigned: 2010-09-24
331-911

331-950

331-958
AMERITECH ILLINOIS
331-959
AMERITECH ILLINOIS
331-976

331-999OSWEGO, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
Date Assigned: 2010-09-22
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