Area code 331
2,304 number blocks indexed across 35 carriers.
States: IL (2,304)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 6534 | New Cingular Wireless PCS LLC - IL | Atlanta, GA | Wireless Carrier | 308 | 36 | att.com |
| 224C | Onvoy LLC | Chicago, IL | Competitive Local Exchange Carrier | 520 | 31 | sinch.com |
| 6333 | Cellco Partnership dba Verizon Wireless - IL | Olathe, KS | Wireless Carrier | 290 | 29 | verizonwireless.com |
| 490J | Boost SubscriberCo LLC | Washington, DC | Wireless Carrier | 13 | 6 | dish.com |
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 74 | 5 | |
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 4 | 4 | hdcarrier.com |
| 6529 | T-Mobile USA Inc | Bellevue, WA | Personal Communications Service (Wireless) | 343 | 2 | t-mobile.com |
| 145J | Terra Nova Telecom Inc | Lakewood Ranch, FL | IP-Enabled Service / VoIP | 1 | 1 | terranova.net |
| 984E | Bandwidth.com CLEC LLC - IL | Cary, NC | Competitive Local Exchange Carrier | 167 | — | bandwidth.com |
| 063E | Peerless Network of Illinois LLC - IL | Chicago, IL | Competitive Local Exchange Carrier | 66 | — | peerlessnetwork.com |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 65 | — | comcast.com |
| 6115 | Level 3 Communications LLC - IL | Westminster, CO | Competitive Local Exchange Carrier | 48 | — | centurylink.com |
| 939H | Commio LLC | Austin, TX | IP-Enabled Service / VoIP | 47 | — | commio.com |
| 7136 | Teleport Communications America LLC - IL | Staten Island, NY | Competitive Local Exchange Carrier | 38 | — | att.com |
| 965H | Fractel LLC | Indialantic, FL | IP-Enabled Service / VoIP | 38 | — | fractel.net |
| 7196 | MCImetro Access Transmission Services LLC - IL | Vienna, VA | Competitive Local Exchange Carrier | 31 | — | verizon.com |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 29 | — | telnyx.com |
| 9329 | Ameritech Illinois | Hoffman Estates, IL | Regional Bell Operating Company | 29 | — | att.com |
| 197D | Vonage America LLC | Holmdel, NJ | IP-Enabled Service / VoIP | 24 | — | vonage.com |
| 516J | Ton80 Communications LLC | Anderson, SC | IP-Enabled Service / VoIP | 20 | — | coretel.net |
| 460K | First Communications LLC | Oakbrook Terrace, IL | IP-Enabled Service / VoIP | 19 | — | |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 19 | — | metropcs.com |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 19 | — | |
| 495J | Stratus Networks Inc | Peoria Heights, IL | IP-Enabled Service / VoIP | 17 | — | stratusnet.com |
| MULT | Multiple OCN Listing | Administrative / Reserved | 14 | — | ||
| 057H | Local Access LLC - IL | Windermere, FL | Competitive Local Exchange Carrier | 12 | — | |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 12 | — | centurylink.com |
| 515J | IP Horizon LLC | Orlando, FL | IP-Enabled Service / VoIP | 8 | — | |
| 516C | AT&T Enterprises LLC | San Antonio, TX | IP-Enabled Service / VoIP | 6 | — | att.com |
| 732J | NUSO LLC | University City, MO | IP-Enabled Service / VoIP | 6 | — | brightlink.com |
| 478J | NUSO LLC | Atlanta, GA | IP-Enabled Service / VoIP | 5 | — | brightlink.com |
| 5447 | Access One Inc - IL | Chicago, IL | Competitive Local Exchange Carrier | 5 | — | accessoneinc.com |
| 138G | Level 3 Telecom of Illinois LLC - IL | Littleton, CO | Competitive Local Exchange Carrier | 3 | — | centurylink.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 2 | — | verizon.com |
| 8702 | RCN Telecom Services of Illinios Inc - IL | Chicago, IL | Competitive Local Exchange Carrier | 2 | — | astound.com |