Maryland, United States
Eastern Time
1:23 AM
Area Code
667
State / Province
Maryland
Country
United States
Time Zone
Eastern Time
Area code 667 covers 102 cities and communities across Maryland, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+16675550100">+16675550100</a><a href="tel:+16675550199">+16675550199</a>Look up which exchange in Maryland a specific 667 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
449 active prefixes in this area code, assigned as 4,345 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–100 of 4,345
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 667-200 | 0 | Columbia | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-200 | 1 | Columbia | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-200 | 2 | Columbia | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-200 | 3 | Columbia | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-200 | 4 | Columbia | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MD (6119) | BLTMMDSN6MD | 238 | — | — |
| 667-200 | 5 | Columbia | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | BLTMMDCHXFX | 238 | — | — |
| 667-200 | 6 | Columbia | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-200 | 7 | Columbia | Landline or VoIP | METROPCS, INC. (5562) | BLTMMDCH40Z | 238 | — | — |
| 667-200 | 8 | Columbia | Landline or VoIP | METROPCS, INC. (5562) | BLTMMDCH40Z | 238 | — | — |
| 667-200 | 9 | Columbia | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-200 | A | Columbia | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-201 | 0 | Bel Air | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-201 | 1 | Bel Air | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-201 | 2 | Bel Air | Landline or VoIP | IP HORIZON LLC (515J) | — | 238 | — | — |
| 667-201 | 3 | Bel Air | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CLMAMDORAMD | 238 | — | — |
| 667-201 | 4 | Bel Air | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CLMAMDORAMD | 238 | — | — |
| 667-201 | 5 | Bel Air | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-201 | 6 | Bel Air | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-201 | 7 | Bel Air | Landline or VoIP | TELNYX LLC (073H) | BLTMMDCHX7X | 238 | — | — |
| 667-201 | 8 | Bel Air | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-201 | 9 | Bel Air | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-201 | A | Bel Air | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-202 | 0 | Elkton | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-202 | 1 | Elkton | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-202 | 2 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 3 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 4 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 5 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 6 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 7 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 8 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | 9 | Elkton | Landline or VoIP | HD CARRIER LLC (321J) | BLTMMDCHXVX | 238 | — | — |
| 667-202 | A | Elkton | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-203 | 0 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 1 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 2 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 3 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 4 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 5 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 6 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 7 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 8 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | 9 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-203 | A | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-204 | 0 | Annapolis | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-204 | 1 | Annapolis | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-204 | 2 | Annapolis | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | BLTMMDCHXFX | 238 | — | — |
| 667-204 | 3 | Annapolis | Landline or VoIP | PAETEC ITEL, LLC (829J) | PIVLMDPKXEX | 238 | — | — |
| 667-204 | 4 | Annapolis | Landline or VoIP | PAETEC ITEL, LLC (829J) | PIVLMDPKXEX | 238 | — | — |
| 667-204 | 5 | Annapolis | Landline or VoIP | PAETEC ITEL, LLC (829J) | PIVLMDPKXEX | 238 | — | — |
| 667-204 | 6 | Annapolis | Landline or VoIP | PAETEC ITEL, LLC (829J) | PIVLMDPKXEX | 238 | — | — |
| 667-204 | 7 | Annapolis | Landline or VoIP | PAETEC ITEL, LLC (829J) | PIVLMDPKXEX | 238 | — | — |
| 667-204 | 8 | Annapolis | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-204 | 9 | Annapolis | Landline or VoIP | IP HORIZON LLC (515J) | — | 238 | — | — |
| 667-204 | A | Annapolis | Landline or VoIP | PAETEC ITEL, LLC (829J) | PIVLMDPKXEX | 238 | — | — |
| 667-205 | 0 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-205 | 1 | Baltimore | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | BLTMMDCHXFX | 238 | — | — |
| 667-205 | 2 | Baltimore | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (7228) | BALTIMORE | 238 | — | — |
| 667-205 | 3 | Baltimore | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (7228) | BALTIMORE | 238 | — | — |
| 667-205 | 4 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-205 | 5 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-205 | 6 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-205 | 7 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-205 | 8 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-205 | 9 | Baltimore | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MD (071F) | BLTMMDCH45Z | 238 | — | — |
| 667-205 | A | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-206 | 0 | Towson | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-206 | 1 | Towson | Landline or VoIP | PEERLESS NETWORK OF MARYLAND, LLC (568G) | BALTIMORE | 238 | — | — |
| 667-206 | 2 | Towson | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | BLTMMDCHXFX | 238 | — | — |
| 667-206 | 3 | Towson | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-206 | 4 | Towson | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | BLTMMDCHXFX | 238 | — | — |
| 667-206 | 5 | Towson | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-206 | 6 | Towson | Landline or VoIP | ONVOY, LLC - MD (876D) | BLTMMDCH42Z | 238 | — | — |
| 667-206 | 7 | Towson | Landline or VoIP | IP HORIZON LLC (515J) | — | 238 | — | — |
| 667-206 | 8 | Towson | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-206 | 9 | Towson | Landline or VoIP | METROPCS, INC. (5562) | BLTMMDCH40Z | 238 | — | — |
| 667-206 | A | Towson | Landline or VoIP | METROPCS, INC. (5562) | BLTMMDCH40Z | 238 | — | — |
| 667-207 | 0 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-207 | 1 | Baltimore | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-207 | 2 | Baltimore | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MD (6119) | BLTMMDSN6MD | 238 | — | — |
| 667-207 | 3 | Baltimore | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-207 | 4 | Baltimore | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-207 | 5 | Baltimore | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-207 | 6 | Baltimore | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MD (6119) | BLTMMDSN6MD | 238 | — | — |
| 667-207 | 7 | Baltimore | Landline or VoIP | CENTURYLINK COMMUNICATIONS, LLC (508J) | BLTMMDDN2MD | 238 | — | — |
| 667-207 | 8 | Baltimore | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MD (6119) | BLTMMDSN6MD | 238 | — | — |
| 667-207 | 9 | Baltimore | Wireless | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (6855) | BLTMMDCH40Z | 238 | — | — |
| 667-207 | A | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-208 | 0 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-208 | 1 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 2 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 3 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 4 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 5 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 6 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 7 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 8 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | 9 | Baltimore | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MD (7325) | BALTIMORE | 238 | — | — |
| 667-208 | A | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
| 667-209 | 0 | Baltimore | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (6395) | BLTOMDKHBMD | 238 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
449
Assignment Blocks
4,345
Rate Centers
102
Carriers of Record
49
| Type | Blocks | Share |
|---|---|---|
| Landline | 22 | 1% |
| Landline or VoIP | 2,536 | 58% |
| Wireless | 1,787 | 41% |
| Carrier | Blocks |
|---|---|
| ONVOY, LLC - MD | 933 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 699 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 590 |
| CORE COMMUNICATIONS, INC.- MD | 452 |
| ONVOY SPECTRUM, LLC | 278 |
| BANDWIDTH.COM CLEC, LLC - MD | 196 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 152 |
| COMMIO, LLC | 97 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 96 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 90 |
| 39 other carriers | 762 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| Baltimore | 76 | 821 |
| Aberdeen | 24 | 242 |
| Pikesville | 24 | 260 |
| Salisbury | 23 | 161 |
| Annapolis | 17 | 184 |
| Catonsville | 12 | 121 |
| Columbia | 12 | 128 |
| Towson | 11 | 114 |
| Glen Burnie | 8 | 81 |
| Odenton | 8 | 80 |
| Bel Air | 7 | 77 |
| Elkton | 7 | 72 |
| Essex | 6 | 60 |
| Parkville | 6 | 62 |
| Prince Frederick | 6 | 61 |
| Cambridge | 5 | 52 |
| Severn | 5 | 52 |
| Westminster | 5 | 53 |
| Armiger-Gibson Island | 4 | 44 |
| Centreville | 4 | 43 |
| Chase | 4 | 35 |
| Crofton | 4 | 37 |
| Dundalk | 4 | 37 |
| Edgewood | 4 | 41 |
| Elkridge | 4 | 43 |
| Ellicott City | 4 | 38 |
| Oxford | 4 | 35 |
| Severna Park | 4 | 36 |
| Solomons | 4 | 36 |
| Arbutus | 3 | 24 |
| Chesapeake City | 3 | 22 |
| Church Hill | 3 | 26 |
| Churchville | 3 | 25 |
| Darlington | 3 | 23 |
| Easton | 3 | 20 |
| Glenwood | 3 | 29 |
| Greensboro | 3 | 23 |
| Hampstead | 3 | 26 |
| New Windsor | 3 | 26 |
| Perryville | 3 | 29 |
| Port Deposit | 3 | 28 |
| Preston | 3 | 27 |
| Reisterstown | 3 | 30 |
| Stevensville | 3 | 30 |
| Still Pond | 3 | 25 |
| Sudlersville | 3 | 20 |
| Waterloo (Washington DC LATA) | 3 | 24 |
| West River | 3 | 32 |
| Berlin | 2 | 20 |
| Bishopville | 2 | 21 |
| Brooklyn Park-Linthicum | 2 | 22 |
| Cardiff | 2 | 13 |
| Cecilton | 2 | 20 |
| Chestertown | 2 | 22 |
| Cockeysville | 2 | 22 |
| Deal Island | 2 | 12 |
| Delmar | 2 | 22 |
| Denton | 2 | 19 |
| Federalsburg | 2 | 13 |
| Fork | 2 | 17 |
| Galena | 2 | 16 |
| Havre de Grace | 2 | 15 |
| Hillsboro | 2 | 18 |
| Hurlock | 2 | 20 |
| Millington | 2 | 15 |
| North Beach | 2 | 22 |
| Ocean City | 2 | 17 |
| Parkton | 2 | 15 |
| Princess Anne | 2 | 14 |
| Queenstown | 2 | 13 |
| Randallstown | 2 | 22 |
| Ridgely | 2 | 16 |
| Rock Hall | 2 | 18 |
| Sherwood Forest | 2 | 22 |
| St Michaels | 2 | 22 |
| Sykesville | 2 | 17 |
| Vienna | 2 | 13 |
| Warwick | 2 | 17 |
| Wingate | 2 | 15 |
| Woodlawn | 2 | 19 |
| Crisfield | 1 | 7 |
| Fallston | 1 | 10 |
| Jarrettsville | 1 | 10 |
| Marion | 1 | 6 |
| Millersville | 1 | 5 |
| Nanticoke | 1 | 2 |
| North East | 1 | 10 |
| Pocomoke | 1 | 10 |
| Rising Sun | 1 | 4 |
| Sharptown | 1 | 7 |
| Silver Run | 1 | 9 |
| Smith Island | 1 | 8 |
| Snow Hill | 1 | 9 |
| Sparks-Glencoe | 1 | 11 |
| Sparrows Point | 1 | 11 |
| Taneytown | 1 | 11 |
| Tilghman | 1 | 9 |
| Trappe | 1 | 7 |
| Union Bridge | 1 | 9 |
| Waterloo | 1 | 10 |
| Willards | 1 | 8 |
| Worthington | 1 | 8 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
Area code 667 is a North American Numbering Plan (NANP) telephone area code assigned to Maryland, United States. It is one of 6 area codes serving Maryland. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 667 is an active North American Numbering Plan (NANP) area code, currently assigned to Maryland, United States. It is safe to answer or dial calls using this area code.
Area code 667 covers 102 cities and communities in Maryland, including Aberdeen, Annapolis, Arbutus, Armiger-Gibson Island, Baltimore, and 97 more localities. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 667 area code observe Eastern Time (IANA timezone: America/New_York). Eastern Time is UTC−5 in winter (EST) and UTC−4 in summer (EDT). When placing a call to a 667 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Maryland, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 667 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 667 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 667 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +16675550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.