{ "url": "https://phonelookup.dev/prefix/us-737", "npa": "737", "slug": "us-737", "iso": "US", "country": "United States", "regions": [ { "code": "TX", "name": "Texas", "exchanges": 347 } ], "exchanges": 347, "known": 332, "byLineType": { "fixed_line": 48, "mobile": 106, "unknown": 15, "voip": 178 }, "carriers": [ { "name": "Onvoy", "exchanges": 81, "byLineType": { "voip": 81 }, "ranges": [ "200–201", "204–205", "210", "214", "237", "241", "245", "247", "250", "260", "271", "273", "277", "282–284", "292", "295", "299", "300", "307", "312", "316–317", "325", "327", "332", "337–338", "344", "361", "366–367", "372", "379", "381", "383", "385", "387–388", "390–391", "400", "409", "418", "427", "432", "434", "436–437", "439", "441", "450", "473", "497", "500", "510", "520", "529–530", "537", "600", "610", "615", "637", "677", "703", "717", "727", "734", "738", "773", "800", "837", "910", "932", "937", "975", "998" ] }, { "name": "AT&T", "exchanges": 44, "byLineType": { "fixed_line": 15, "mobile": 29 }, "ranges": [ "207", "219", "223", "228–230", "254", "258", "261", "263", "265", "267", "269", "272", "276", "280", "285", "289", "291", "305–306", "319", "330", "351", "362", "368", "382", "393", "395", "401", "406–407", "412", "425", "428", "430", "433", "435", "442", "445", "471", "701", "881", "983" ] }, { "name": "T-Mobile", "exchanges": 39, "byLineType": { "mobile": 39 }, "ranges": [ "206", "217", "221", "225", "232", "264", "274", "287", "293–294", "296–298", "302", "318", "321", "323–324", "326", "328", "335", "340–342", "363", "398–399", "405", "413–414", "421", "424", "426", "440", "448", "455", "618", "708", "747" ] }, { "name": "Verizon", "exchanges": 32, "byLineType": { "fixed_line": 4, "mobile": 28 }, "ranges": [ "203", "208", "213", "215", "226", "233", "235", "240", "248", "256", "262", "268", "278–279", "308", "314", "329", "343", "349", "352", "376", "389", "397", "403", "408", "419", "429", "431", "484", "781", "802", "843" ] }, { "name": "Fractel", "exchanges": 26, "byLineType": { "voip": 26 }, "ranges": [ "288", "336", "345", "348", "356", "373", "377", "386", "465", "477", "577", "587", "667", "688", "732–733", "758", "766", "786", "788", "799", "842", "877", "899", "946", "977" ] }, { "name": "Bandwidth.com", "exchanges": 21, "byLineType": { "voip": 21 }, "ranges": [ "216", "231", "234", "236", "238", "242", "244", "257", "275", "290", "301", "322", "331", "334", "339", "355", "394", "702", "757", "808", "973" ] }, { "name": "Ton80 Communications", "exchanges": 9, "byLineType": { "voip": 9 }, "ranges": [ "378", "678", "742", "746", "762", "767", "825", "828", "864" ] }, { "name": "COMMIO LLC", "exchanges": 7, "byLineType": { "voip": 7 }, "ranges": [ "286", "369–371", "374", "420", "867" ] }, { "name": "Foremost Telecommunications", "exchanges": 7, "byLineType": { "fixed_line": 7 }, "ranges": [ "222", "333", "444", "666", "777", "888", "999" ] }, { "name": "Emergency Networks", "exchanges": 6, "byLineType": { "mobile": 6 }, "ranges": [ "304", "357", "375", "410", "710", "775" ] }, { "name": "Lumen", "exchanges": 5, "byLineType": { "fixed_line": 4, "voip": 1 }, "ranges": [ "202", "227", "259", "266", "443" ] }, { "name": "Dish Wireless", "exchanges": 4, "byLineType": { "mobile": 4 }, "ranges": [ "313", "315", "360", "384" ] }, { "name": "IP Horizon", "exchanges": 4, "byLineType": { "voip": 4 }, "ranges": [ "281", "415–417" ] }, { "name": "Peerless Network", "exchanges": 4, "byLineType": { "voip": 4 }, "ranges": [ "218", "243", "251–252" ] }, { "name": "Millicorp", "exchanges": 3, "byLineType": { "voip": 3 }, "ranges": [ "770", "980", "990" ] }, { "name": "Spectrum", "exchanges": 3, "byLineType": { "fixed_line": 3 }, "ranges": [ "209", "212", "404" ] }, { "name": "Terra Nova Telecom", "exchanges": 3, "byLineType": { "voip": 3 }, "ranges": [ "353", "422", "900" ] }, { "name": "Vonage", "exchanges": 3, "byLineType": { "voip": 3 }, "ranges": [ "220", "253", "365" ] }, { "name": "Bestline Communications", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "224", "346" ] }, { "name": "Five9", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "364", "396" ] }, { "name": "HD Carrier", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "310", "787" ] }, { "name": "Nuso", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "350", "354" ] }, { "name": "Optimum", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "347", "380" ] }, { "name": "Skyetel", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "303", "707" ] }, { "name": "Twilio International", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "392", "895" ] }, { "name": "Voip Street", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "239", "730" ] }, { "name": "8x8", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "880" ] }, { "name": "Ahoi", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "438" ] }, { "name": "Airespring", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "246" ] }, { "name": "Astound Broadband", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "704" ] }, { "name": "Brightlink Communications", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "270" ] }, { "name": "Callworks Corporation", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "309" ] }, { "name": "Comcast", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "358" ] }, { "name": "Exiant", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "255" ] }, { "name": "Hadlo Technologies", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "359" ] }, { "name": "IP Global Networks", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "249" ] }, { "name": "Paetec Itel", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "320" ] }, { "name": "TELNYX", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "402" ] }, { "name": "Tpx Communications", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "931" ] }, { "name": "USFON INC", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "737" ] }, { "name": "Wavenation", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "423" ] } ], "grid": "vvffvvmfmfvufmvmvmvfvmfffmmvmfmvmmvmvvvvmvvvvvvvffvvvvfvmvffvfmmmmfmmfvvfvmvmvmmmvvvvmvmvfvmvmmvmmmvvvmvmmmvmvvuvmmmvvmffmvmmvmvmmmvvfvmvvvvmmmmvvffvmfmmvfvvmvvmvmmfvvvmvvvvvvmmvvvfvmvmvvvvmvvvmvmfmmmvfvmfmmmmvmummmvvvvmvmvfmmmvmmmmvmvmvvfvmvffff--m-v----m---------v-----f-v---v------f------------v--v---------vu--------v--------vv------v-----------------u---------------------v---------v------------v---------vu---v--m------------------v----------------------------fv---------vv---------v-----------umvvf--vm-mu-----v---------v--v-vvv--fv---v---vm---------vv---v---vv--v--v-m-f---m----vvv----------vv-m-----v--u-------------v--v-u------v----vf--------------------v--v---------v--vm------f------v---vv---------vu-------------------fv----v--------v---u-------uu-------------v-vuv--v--m------v-------vf", "patterns": { "all": "^\\+1737[2-9]\\d{6}$", "fixed_line": "^\\+1737(?:2(?:0[2379]|1[29]|2[2-49]|4[89]|5[489]|6[169]|72|89)|3(?:19|[28]0|33|4[67]|5[04]|64|96)|4(?:0[14]|23|38|4[2-5]|71|84)|666|7(?:04|[37]7)|8(?:43|88)|9(?:31|99))\\d{4}$", "mobile": "^\\+1737(?:2(?:0[68]|1[357]|2[1568]|3[0235]|40|56|6[2-578]|7[4689]|8[057]|9[1346-8])|3(?:0[24-68]|1[3-58]|2[134689]|3[05]|4[0-39]|5[127]|6[0238]|7[56]|8[249]|9[357-9])|4(?:0[35-8]|1[02-49]|2[14-689]|3[0135]|4[08]|55)|618|7(?:0[18]|10|47|75|81)|8(?:02|81)|983)\\d{4}$", "voip": "^\\+1737(?:2(?:0[0145]|1[0468]|2[07]|3[146-9]|4[1-7]|5[0-357]|60|7[01357]|8[1-468]|9[0259])|3(?:0[01379]|1[0267]|2[257]|3[1246-9]|4[458]|5[35689]|6[15-79]|7[0-47-9]|8[135-8]|9[0-24])|4(?:0[029]|1[5-8]|2[027]|3[24679]|41|50|65|7[37]|97)|5(?:[01]0|2[09]|3[07]|[78]7)|6(?:00|1[05]|[36]7|7[78]|88)|7(?:0[237]|[12]7|3[02-48]|4[26]|5[78]|6[267]|7[03]|8[6-8]|99)|8(?:0[08]|2[58]|[37]7|42|6[47]|80|9[59])|9(?:[018]0|3[27]|46|7[357]|9[08]))\\d{4}$" }, "sandbox": { "input": "+17375550123", "valid": true, "type": "Fixed line or mobile", "region": "US", "formats": { "e164": "+17375550123", "international": "+1 737-555-0123", "national": "(737) 555-0123", "rfc3966": "tel:+1-737-555-0123" }, "parts": { "countryCode": "+1", "destinationCode": "737", "destinationKind": "area code", "subscriber": "5550123" } }, "faq": [ { "question": "Where is area code 737?", "answer": "Area code 737 is in Texas, in the United States: all 347 of its exchanges on record are there. From abroad it is dialled +1 737, then the seven-digit number." }, { "question": "Is a 737 number mobile or landline?", "answer": "Either: in the North American Numbering Plan the line type belongs to the exchange (the three digits after the area code), not to the area code. Of the 347 exchanges on record in 737, 106 (31%) were allocated as mobile, 48 (14%) as fixed line, 178 (51%) as VoIP and 15 (4%) have no line type on record. A number can have been ported since, to another carrier and even to another line type." }, { "question": "Which carriers have numbers in area code 737?", "answer": "41 carriers hold exchanges in 737 on record; the most: Onvoy (81), AT&T (44) and T-Mobile (39). These are the original allocations: with number portability, a number may be served by another carrier today, which only a live carrier lookup (an HLR or MNP query) can tell." }, { "question": "How do I validate a 737 phone number?", "answer": "In E.164 a 737 number matches ^\\+1737[2-9]\\d{6}$: +1, the area code, a central office code that does not start with 0 or 1, then four digits. Written nationally it reads (737) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP." } ], "neighbours": { "sameRegion": [ "us-210", "us-214", "us-254", "us-281", "us-325", "us-346", "us-361", "us-409", "us-430", "us-432", "us-469", "us-512", "us-682", "us-713", "us-726", "us-806", "us-817", "us-830", "us-832", "us-903", "us-915", "us-936", "us-940", "us-945", "us-956", "us-972", "us-979" ], "previous": "us-734", "next": "us-738" }, "meta": { "dataAsOf": "2026-10-25", "dataPoints": 347, "references": [ { "authority": "NANPA", "title": "North American Numbering Plan Administrator", "url": "https://nanpa.com/" }, { "authority": "CNAC", "title": "Canadian Numbering Administrator", "url": "https://www.cnac.ca/" }, { "authority": "ITU", "title": "National numbering plan: United States", "url": "https://www.itu.int/oth/T02020000DE/en" } ] } }