Missouri, United States
Central Time
12:23 AM
Area Code
816
State / Province
Missouri
Country
United States
Time Zone
Central Time
Area code 816 covers 111 cities and communities across Missouri, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+18165550100">+18165550100</a><a href="tel:+18165550199">+18165550199</a>Look up which exchange in Missouri a specific 816 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
785 active prefixes in this area code, assigned as 6,205 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 6,205
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 816-200 | 0 | Kansas City | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-200 | 1 | Kansas City | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-200 | 2 | Kansas City | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-200 | 3 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-200 | 4 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-200 | 5 | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | KSCYMO09YMD | 524 | — | — |
| 816-200 | 6 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-200 | 7 | Kansas City | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-200 | 8 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-200 | 9 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-200 | A | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | KSCYMO09YMD | 524 | — | — |
| 816-201 | A | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (6123) | KANSAS CITY | 524 | — | — |
| 816-202 | A | Kansas City | Landline or VoIP | SPOK, INC. (6630) | KSCYMO55X3X | 524 | — | — |
| 816-203 | 0 | Kansas City | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-203 | 1 | Kansas City | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-203 | 2 | Kansas City | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-203 | 3 | Kansas City | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-203 | 4 | Kansas City | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-203 | 5 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-203 | 6 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-203 | 7 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-203 | 8 | Kansas City | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MO (4932) | KSCZMODR3MD | 524 | — | — |
| 816-203 | 9 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-203 | A | Kansas City | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-204 | 0 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 1 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 2 | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | KSCYMO09YMD | 524 | — | — |
| 816-204 | 3 | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | KSCYMO09YMD | 524 | — | — |
| 816-204 | 4 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 5 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 6 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 7 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 8 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-204 | 9 | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | KSCYMO09YMD | 524 | — | — |
| 816-204 | A | Kansas City | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - MO (7218) | KSCYMO09YMD | 524 | — | — |
| 816-205 | 0 | St Joseph | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | INDPMOXCGT0 | 524 | — | — |
| 816-205 | 1 | St Joseph | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | INDPMOXCGT0 | 524 | — | — |
| 816-205 | 2 | St Joseph | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (5814) | INDPMOBHBMD | 524 | — | — |
| 816-205 | 3 | St Joseph | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (5814) | INDPMOBHBMD | 524 | — | — |
| 816-205 | 4 | St Joseph | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MO (4932) | KSCZMODR3MD | 524 | — | — |
| 816-205 | 5 | St Joseph | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-205 | 6 | St Joseph | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-205 | 7 | St Joseph | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MO (4932) | KSCZMODR3MD | 524 | — | — |
| 816-205 | 8 | St Joseph | Landline or VoIP | PEERLESS NETWORK OF MISSOURI, LLC - MO (225F) | KANSAS CITY | 524 | — | — |
| 816-205 | 9 | St Joseph | Landline or VoIP | PAETEC ITEL, LLC (829J) | KSCYMO55XWZ | 524 | — | — |
| 816-205 | A | St Joseph | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (5814) | INDPMOBHBMD | 524 | — | — |
| 816-206 | A | Kansas City | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (5814) | INDPMOBHBMD | 524 | — | — |
| 816-207 | 0 | Lees Summit | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-207 | 1 | Lees Summit | Landline | SOUTHWESTERN BELL (9533) | LEE'S SUMMIT | 524 | — | — |
| 816-207 | 2 | Lees Summit | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-207 | 3 | Lees Summit | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-207 | 4 | Lees Summit | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-207 | 5 | Lees Summit | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MO (993E) | KSCYKSJOSMD | 524 | — | — |
| 816-207 | 6 | Lees Summit | Landline or VoIP | TWC IP ENABLED SERVICES, LLC (793K) | KSCYMO03X1X | 524 | — | — |
| 816-207 | 7 | Lees Summit | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | INDPMOXCGT0 | 524 | — | — |
| 816-207 | 8 | Lees Summit | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | INDPMOXCGT0 | 524 | — | — |
| 816-207 | 9 | Lees Summit | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | INDPMOXCGT0 | 524 | — | — |
| 816-207 | A | Lees Summit | Landline | SOUTHWESTERN BELL (9533) | LEE'S SUMMIT | 524 | — | — |
| 816-208 | 0 | Leavenworth Lansing | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-208 | 1 | Leavenworth Lansing | Landline or VoIP | METROPCS, INC. (5562) | KSCZMOVRAMD | 524 | — | — |
| 816-208 | 2 | Leavenworth Lansing | Landline or VoIP | TELNYX LLC (073H) | KSCYMO55XNY | 524 | — | — |
| 816-208 | 3 | Leavenworth Lansing | Landline or VoIP | TELNYX LLC (073H) | KSCYMO55XNY | 524 | — | — |
| 816-208 | 4 | Leavenworth Lansing | Landline or VoIP | TELNYX LLC (073H) | KSCYMO55XSY | 524 | — | — |
| 816-208 | 5 | Leavenworth Lansing | Landline or VoIP | AT&T CORP. (516C) | KSCYMO09QMD | 524 | — | — |
| 816-208 | 6 | Leavenworth Lansing | Landline or VoIP | TELNYX LLC (073H) | KSCCMOFO2MD | 524 | — | — |
| 816-208 | 7 | Leavenworth Lansing | Wireless | ONVOY SPECTRUM, LLC (624H) | KSCYMO55XYY | 524 | — | — |
| 816-208 | 8 | Leavenworth Lansing | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-208 | 9 | Leavenworth Lansing | Landline or VoIP | ONVOY, LLC - MO (093F) | KSCYMO55XXX | 524 | — | — |
| 816-208 | A | Leavenworth Lansing | Landline or VoIP | AT&T CORP. (516C) | KSCYMO09QMD | 524 | — | — |
| 816-209 | 0 | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | 1 | Cameron | Landline or VoIP | PEERLESS NETWORK OF MISSOURI, LLC - MO (225F) | KANSAS CITY | 524 | — | — |
| 816-209 | 2 | Cameron | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (5814) | INDPMOBHBMD | 524 | — | — |
| 816-209 | 3 | Cameron | Landline or VoIP | METROPCS, INC. (5562) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | 4 | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | 5 | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | 6 | Cameron | Landline or VoIP | PEERLESS NETWORK OF MISSOURI, LLC - MO (225F) | KANSAS CITY | 524 | — | — |
| 816-209 | 7 | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | 8 | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | 9 | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-209 | A | Cameron | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 0 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 1 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 2 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 3 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 4 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 5 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 6 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 7 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 8 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | 9 | Kansas City | Landline or VoIP | METROPCS, INC. (5562) | KSCZMOVRAMD | 524 | — | — |
| 816-210 | A | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-212 | A | Kansas City | Landline | SOUTHWESTERN BELL (9533) | BENTON | 524 | — | — |
| 816-213 | 0 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 1 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 2 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 3 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 4 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 5 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 6 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
| 816-213 | 7 | Kansas City | Wireless | AERIAL COMMUNICATIONS, INC. (6701) | KSCZMOVRAMD | 524 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
785
Assignment Blocks
6,205
Rate Centers
111
Carriers of Record
54
| Type | Blocks | Share |
|---|---|---|
| Landline | 1,373 | 22% |
| Landline or VoIP | 2,615 | 42% |
| Wireless | 2,217 | 36% |
| Carrier | Blocks |
|---|---|
| SOUTHWESTERN BELL | 990 |
| AERIAL COMMUNICATIONS, INC. | 985 |
| ONVOY, LLC - MO | 742 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 660 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 398 |
| BANDWIDTH.COM CLEC, LLC - MO | 313 |
| EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO | 240 |
| LEVEL 3 COMMUNICATIONS, LLC - MO | 235 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 167 |
| TWC IP ENABLED SERVICES, LLC | 123 |
| 44 other carriers | 1,352 |
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 |
|---|---|---|
| Kansas City | 442 | 3,274 |
| St Joseph | 40 | 350 |
| Lees Summit | 20 | 170 |
| Belton | 17 | 177 |
| Liberty | 16 | 138 |
| Blue Springs | 15 | 125 |
| Cameron | 13 | 143 |
| Harrisonville | 7 | 77 |
| Odessa | 7 | 65 |
| Excelsior Springs | 6 | 54 |
| Smithville | 6 | 55 |
| Adrian | 5 | 49 |
| Agency | 5 | 48 |
| Ferrelview | 5 | 34 |
| Greenwood | 5 | 55 |
| Kearney | 5 | 42 |
| Richmond | 5 | 52 |
| Farley | 4 | 34 |
| Holden | 4 | 31 |
| Oak Grove | 4 | 41 |
| Archie | 3 | 30 |
| Buckner | 3 | 31 |
| East Atchison | 3 | 24 |
| Freeman | 3 | 9 |
| Grain Valley | 3 | 33 |
| Henrietta | 3 | 19 |
| Kingsville | 3 | 14 |
| Lawson | 3 | 24 |
| Lonejack | 3 | 33 |
| Maysville | 3 | 28 |
| Platte City | 3 | 31 |
| San Antonio | 3 | 24 |
| Savannah | 3 | 26 |
| Stewartsville | 3 | 17 |
| Union Star | 3 | 18 |
| Amazonia | 2 | 16 |
| Avenue City | 2 | 17 |
| Bolckow | 2 | 14 |
| Clarksdale | 2 | 14 |
| Cleveland | 2 | 6 |
| Cosby | 2 | 14 |
| De Kalb | 2 | 20 |
| Drexel | 2 | 5 |
| East Lynne | 2 | 8 |
| Easton | 2 | 17 |
| Excelsior Springs MCA4 | 2 | 11 |
| Fillmore | 2 | 14 |
| Garden City | 2 | 8 |
| Gower | 2 | 19 |
| Hamilton | 2 | 21 |
| Helena | 2 | 15 |
| Holt | 2 | 17 |
| Kearney MCA3 | 2 | 12 |
| Kidder | 2 | 15 |
| Kingston | 2 | 14 |
| Lathrop | 2 | 5 |
| Leavenworth Lansing | 2 | 22 |
| Orrick | 2 | 14 |
| Osborn | 2 | 21 |
| Peculiar | 2 | 8 |
| Plattsburg | 2 | 21 |
| Pleasant Hill | 2 | 21 |
| Rosendale | 2 | 18 |
| Rushville | 2 | 17 |
| Strasburg | 2 | 15 |
| Turney | 2 | 14 |
| Wellington | 2 | 13 |
| Whitesville | 2 | 13 |
| Archie MCA5 | 1 | 7 |
| Buckner MCA3 | 1 | 11 |
| Camden Point | 1 | 10 |
| Camden Point MCA4 | 1 | 11 |
| Cleveland MCA4 | 1 | 1 |
| Dearborn | 1 | 11 |
| Dearborn MCA5 | 1 | 11 |
| Drexel MCA5 | 1 | 1 |
| East Lynne MCA5 | 1 | 1 |
| Edgerton | 1 | 9 |
| Edgerton MCA4 | 1 | 7 |
| Farley MCA3 | 1 | 10 |
| Ferrelview MCA3 | 1 | 10 |
| Freeman MCA5 | 1 | 1 |
| Garden City MCA5 | 1 | 1 |
| Grain Valley MCA3 | 1 | 10 |
| Harrisonville MCA4 | 1 | 11 |
| Henrietta MCA5 | 1 | 7 |
| Holden MCA5 | 1 | 1 |
| Holt MCA4 | 1 | 11 |
| Kingsville MCA5 | 1 | 8 |
| Lake Lotawana | 1 | 11 |
| Lake Lotawana MCA3 | 1 | 9 |
| Lathrop MCA5 | 1 | 1 |
| Lawson MCA5 | 1 | 11 |
| Lonejack MCA4 | 1 | 11 |
| Missouri City | 1 | 10 |
| Missouri City MCA3 | 1 | 8 |
| Oak Grove MCA4 | 1 | 11 |
| Odessa MCA5 | 1 | 1 |
| Orrick MCA4 | 1 | 8 |
| Peculiar MCA4 | 1 | 1 |
| Platte City MCA3 | 1 | 11 |
| Plattsburg MCA5 | 1 | 11 |
| Pleasant Hill MCA4 | 1 | 11 |
| Richmond MCA5 | 1 | 11 |
| Smithville MCA3 | 1 | 11 |
| Strasburg MCA5 | 1 | 10 |
| Trimble | 1 | 11 |
| Trimble MCA4 | 1 | 11 |
| Wellington MCA5 | 1 | 10 |
| Weston | 1 | 11 |
| Weston MCA4 | 1 | 11 |
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 816 is a North American Numbering Plan (NANP) telephone area code assigned to Missouri, United States. It is one of 9 area codes serving Missouri. 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. 816 is an active North American Numbering Plan (NANP) area code, currently assigned to Missouri, United States. It is safe to answer or dial calls using this area code.
Area code 816 covers 111 cities and communities in Missouri, including Adrian, Agency, Amazonia, Archie, Archie Mca5, and 106 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 816 area code observe Central Time (IANA timezone: America/Chicago). Central Time is UTC−6 in winter (CST) and UTC−5 in summer (CDT). When placing a call to a 816 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Missouri, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 816 + 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 1 816 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 816 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +18165550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.