Ontario, Canada
Eastern Time
12:13 PM
Area Code
343
State / Province
Ontario
Country
Canada
Time Zone
Eastern Time
Area code 343 covers 116 cities and communities across Ontario, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+13435550100">+13435550100</a><a href="tel:+13435550199">+13435550199</a>Look up which exchange in Ontario a specific 343 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
642 active prefixes in this area code, assigned as 642 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 642
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 343-200 | A | Rockland | Landline or VoIP | VIDEOTRON LTD. (8306) | RKLDON011MD | 888 | 805105 | — |
| 343-201 | A | Alfred | Wireless | VIDEOTRON LTD. (328F) | LEFVON012MD | 888 | 805105 | — |
| 343-202 | A | Ottawa | Wireless | VIDEOTRON LTD. (328F) | OTWBONMG1MD | 888 | 805105 | — |
| 343-203 | A | Ottawa | Landline | BELL ONTARIO (8051) | OTTAWA RIDEAU | 888 | 805105 | — |
| 343-204 | A | Ottawa | Wireless | VIDEOTRON LTD. (328F) | OTWAON263MD | 888 | 805105 | — |
| 343-205 | A | Adolphustown | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-206 | A | Bath | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-207 | A | Enterprise | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-208 | A | Gananoque | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-209 | A | Ottawa | Wireless | VIDEOTRON LTD. (328F) | OTWAON263MD | 888 | 805105 | — |
| 343-210 | A | Clarence Creek | Landline or VoIP | ISP TELECOM, INC. (4727) | OTWAON10OMD | 888 | 805105 | — |
| 343-212 | A | Jockvale | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | JKVLON052MD | 888 | 805105 | — |
| 343-213 | A | Carleton Place | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CLPCON041MD | 888 | 805105 | — |
| 343-214 | A | Manotick | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | MANKON041MD | 888 | 805105 | — |
| 343-215 | A | Hawkesbury | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | HWBYON613MD | 888 | 805139 | — |
| 343-216 | A | Sydenham | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | HRSMON050MD | 888 | 805121 | — |
| 343-217 | A | Tamworth | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | TMWOON370MD | 888 | 805121 | — |
| 343-218 | A | Elgin | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | ELGNON010MD | 888 | 805129 | — |
| 343-219 | A | Lanark | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | LNRKON120MD | 888 | 805129 | — |
| 343-220 | A | Portland | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | PTLDON010MD | 888 | 805129 | — |
| 343-221 | A | Orleans | Landline or VoIP | ROGERS COMMUNICATIONS CANADA INC. (743B) | ORLNON064MD | 888 | 805105 | — |
| 343-222 | A | Picton | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | PCTNONAA0MD | 888 | 805126 | — |
| 343-223 | A | Chalk River | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CKRVON383MD | 888 | 805140 | — |
| 343-224 | A | Ottawa | Landline or VoIP | ALLSTREAM INC. (8304) | OTWAON058MD | 888 | 805105 | — |
| 343-225 | A | Brockville | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | BKVLON45HMD | 888 | 805130 | — |
| 343-226 | A | Russell | Landline or VoIP | ISP TELECOM, INC. (4727) | OTWAON10OMD | 888 | 805105 | — |
| 343-227 | A | Ottawa | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | OTWAONPL1MD | 888 | 805105 | — |
| 343-228 | A | Denbigh | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | DENBON300MD | 888 | 805126 | — |
| 343-229 | A | Madoc | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | MADCON330MD | 888 | 805126 | — |
| 343-230 | A | Marmora | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | MRMRON330MD | 888 | 805126 | — |
| 343-231 | A | Maynooth | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | MYNTON340MD | 888 | 805126 | — |
| 343-232 | A | Northbrook | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | NBRKON350MD | 888 | 805126 | — |
| 343-233 | A | Plevna | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | PLVNON330MD | 888 | 805126 | — |
| 343-234 | A | Tweed | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | TWEDON400MD | 888 | 805126 | — |
| 343-235 | A | Alexandria | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | ALXNON210MD | 888 | 805142 | — |
| 343-236 | A | Iroquois | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | IRQSON160MD | 888 | 805142 | — |
| 343-237 | A | Maxville | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | MXVLON300MD | 888 | 805142 | — |
| 343-238 | A | Morrisburg | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | MSBGON310MD | 888 | 805142 | — |
| 343-239 | A | St Isidore de Prescott | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | STIPON010MD | 888 | 805142 | — |
| 343-240 | A | Carp | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CARPON391MD | 888 | 805105 | — |
| 343-241 | A | Barry's Bay | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | BYBAON360MD | 888 | 805140 | — |
| 343-242 | A | Calabogie | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CALBON370MD | 888 | 805140 | — |
| 343-243 | A | Cobden | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CBDNON400MD | 888 | 805140 | — |
| 343-244 | A | Ottawa | Landline or VoIP | EXATEL, INC. (3147) | OTWAON23PMD | 888 | 805105 | — |
| 343-245 | A | Deep River | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | DPRVON410MD | 888 | 805140 | — |
| 343-246 | A | Eganville | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | EGVLON430MD | 888 | 805140 | — |
| 343-247 | A | Killaloe | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | KLLOON470MD | 888 | 805140 | — |
| 343-248 | A | Whitney | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | WHTYON060MD | 888 | 805140 | — |
| 343-249 | A | Athens | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | ATHNON010MD | 888 | 805130 | — |
| 343-250 | A | Cardinal | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CRDNON150MD | 888 | 805130 | — |
| 343-251 | A | Delta | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | DELTON010MD | 888 | 805130 | — |
| 343-252 | A | Seeleys Bay | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | SYBAON010MD | 888 | 805121 | — |
| 343-253 | A | Coe Hill | Landline or VoIP | TELUS INTEGRATED COMMUNICATIONS (2782) | CEHLON290MD | 888 | 805126 | — |
| 343-254 | A | Ottawa | Landline or VoIP | FREEDOM MOBILE INC. (787G) | OTWAON23XIX | 888 | 805105 | — |
| 343-255 | A | Frankford | Landline or VoIP | INNSYSVOICE CORP - ON (383H) | BLVLON24NMD | 888 | 805126 | — |
| 343-256 | A | Crysler | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | OTWAON23XKX | 888 | 805105 | — |
| 343-257 | A | Merrickville | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | OTWAON23XKX | 888 | 805105 | — |
| 343-258 | A | Pakenham | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | OTWAON23XKX | 888 | 805105 | — |
| 343-259 | A | South Mountain | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | OTWAON23XKX | 888 | 805105 | — |
| 343-260 | A | Brockville | Wireless | TELE-MOBILE COMPANY DBA TELUS MOBILITY (8303) | BKVLON45FMD | 888 | 805130 | — |
| 343-261 | A | Belleville | Wireless | TELE-MOBILE COMPANY DBA TELUS MOBILITY (8303) | BLVLON244MD | 888 | 805126 | — |
| 343-262 | A | Ottawa | Wireless | TELE-MOBILE COMPANY DBA TELUS MOBILITY (8303) | OTWAON10BMD | 888 | 805105 | — |
| 343-263 | A | Belleville | Wireless | TELE-MOBILE COMPANY DBA TELUS MOBILITY (8303) | BLVLON244MD | 888 | 805126 | — |
| 343-264 | A | Brockville | Wireless | TELE-MOBILE COMPANY DBA TELUS MOBILITY (8303) | BKVLON45FMD | 888 | 805130 | — |
| 343-265 | A | Deseronto | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | KGTNON08X2X | 888 | 805121 | — |
| 343-266 | A | Kingston | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | KGTNON08X2X | 888 | 805121 | — |
| 343-267 | A | Napanee | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | KGTNON08X2X | 888 | 805121 | — |
| 343-268 | A | Arden | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | BLVLON24KMD | 888 | 805126 | — |
| 343-269 | A | Bancroft | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | BLVLON24KMD | 888 | 805126 | — |
| 343-270 | A | Belleville | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | BLVLON24KMD | 888 | 805126 | — |
| 343-271 | A | Brighton | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | BLVLON24KMD | 888 | 805126 | — |
| 343-272 | A | Northbrook | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | BLVLON24KMD | 888 | 805126 | — |
| 343-273 | A | Plevna | Landline or VoIP | COMWAVE NETWORKS INC. - ON (160G) | BLVLON24KMD | 888 | 805126 | — |
| 343-274 | A | Harrowsmith | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-275 | A | Inverary | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-276 | A | Napanee | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-277 | A | Newburgh | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-278 | A | Odessa | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-279 | A | Seeleys Bay | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-280 | A | Selby | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-281 | A | Sydenham | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-282 | A | Tamworth | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-283 | A | Verona | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-284 | A | Wolfe Island | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-285 | A | Carleton Place | Wireless | BELL CELLULAR, INC. (6574) | JKVLON05AMD | 888 | 805105 | — |
| 343-286 | A | Yarker | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-287 | A | Deseronto | Landline or VoIP | DISTRIBUTEL COMMUNICATIONS LIMITED - ON (082E) | KGTNON08XMD | 888 | 805121 | — |
| 343-288 | A | Cornwall | Landline or VoIP | ROXBOROUGH TELEPHONE COMPANY LIMITED - ON (287H) | CRNWON24BMD | 888 | 805142 | — |
| 343-290 | A | Kingston | Landline or VoIP | ALLSTREAM INC. (8304) | KGTNONXN0MD | 888 | 805121 | — |
| 343-291 | A | Ottawa | Landline or VoIP | ALLSTREAM INC. (8304) | OTWAON058MD | 888 | 805105 | — |
| 343-292 | A | Ottawa | Landline or VoIP | ALLSTREAM INC. (8304) | OTWAON058MD | 888 | 805105 | — |
| 343-293 | A | Kingston | Landline or VoIP | FIBERNETICS CORPORATION (464D) | KGTNON08UMD | 888 | 805121 | — |
| 343-294 | A | Ottawa | Landline or VoIP | ALLSTREAM INC. (8304) | OTWAON058MD | 888 | 805105 | — |
| 343-295 | A | Napanee | Wireless | FREEDOM MOBILE INC. (383F) | NPNEONEC0MD | 888 | 805121 | — |
| 343-296 | A | Carleton Place | Landline or VoIP | IRISTEL INC. - ON (154E) | OTWAON23X1X | 888 | 805105 | — |
| 343-297 | A | Ottawa | Landline or VoIP | FREEDOM MOBILE INC. (787G) | OTWAON23XIX | 888 | 805105 | — |
| 343-298 | A | Alfred | Landline or VoIP | ISP TELECOM, INC. (4727) | OTWAON10OMD | 888 | 805105 | — |
| 343-299 | A | Cumberland | Landline or VoIP | IXICA COMMUNICATIONS, INC. (812H) | OTWAON23XSX | 888 | 805105 | — |
| 343-300 | A | Brockville | Landline or VoIP | IRISTEL INC. - ON (154E) | BKVLON454MD | 888 | 805130 | — |
| 343-301 | A | Cornwall | Landline or VoIP | IRISTEL INC. - ON (154E) | CRNWON248MD | 888 | 805142 | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
642
Assignment Blocks
642
Rate Centers
116
Carriers of Record
28
| Type | Blocks | Share |
|---|---|---|
| Landline | 20 | 3% |
| Landline or VoIP | 535 | 83% |
| Wireless | 87 | 14% |
| Carrier | Blocks |
|---|---|
| FIBERNETICS CORPORATION | 92 |
| TELUS INTEGRATED COMMUNICATIONS | 83 |
| DISTRIBUTEL COMMUNICATIONS LIMITED - ON | 65 |
| IRISTEL INC. - ON | 64 |
| TEKSAVVY SOLUTIONS INC. - ON | 53 |
| ISP TELECOM, INC. | 41 |
| INNSYSVOICE CORP - ON | 33 |
| BELL CELLULAR, INC. | 28 |
| NEXICOM TELECOMMUNICATIONS INC. - ON | 22 |
| FREEDOM MOBILE INC. | 21 |
| 18 other carriers | 140 |
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 |
|---|---|---|
| Ottawa | 104 | 104 |
| Kingston | 23 | 23 |
| Cornwall | 22 | 22 |
| Belleville | 19 | 19 |
| Brockville | 17 | 17 |
| Bancroft | 13 | 13 |
| Kanata-Stittsville | 12 | 12 |
| Jockvale | 10 | 10 |
| Merrickville | 10 | 10 |
| Carleton Place | 9 | 9 |
| Smiths Falls | 9 | 9 |
| Hawkesbury | 8 | 8 |
| Orleans | 8 | 8 |
| Vankleek Hill | 8 | 8 |
| Alfred | 7 | 7 |
| Pakenham | 7 | 7 |
| Rockland | 7 | 7 |
| Tweed | 7 | 7 |
| Arnprior | 6 | 6 |
| Bloomfield | 6 | 6 |
| Brighton | 6 | 6 |
| Casselman | 6 | 6 |
| Frankford | 6 | 6 |
| Napanee | 6 | 6 |
| Northbrook | 6 | 6 |
| Pembroke | 6 | 6 |
| Picton | 6 | 6 |
| Richmond | 6 | 6 |
| Wellington | 6 | 6 |
| Almonte | 5 | 5 |
| Arden | 5 | 5 |
| Carp | 5 | 5 |
| Chesterville | 5 | 5 |
| Clarence Creek | 5 | 5 |
| Cumberland | 5 | 5 |
| Deseronto | 5 | 5 |
| Embrun | 5 | 5 |
| Gloucester | 5 | 5 |
| Kemptville | 5 | 5 |
| Madoc | 5 | 5 |
| Marmora | 5 | 5 |
| Maynooth | 5 | 5 |
| Morrisburg | 5 | 5 |
| Perth | 5 | 5 |
| Plevna | 5 | 5 |
| Russell | 5 | 5 |
| Stirling | 5 | 5 |
| Trenton | 5 | 5 |
| Winchester | 5 | 5 |
| Alexandria | 4 | 4 |
| Bath | 4 | 4 |
| Bourget | 4 | 4 |
| Cardiff | 4 | 4 |
| Coe Hill | 4 | 4 |
| Constance Bay | 4 | 4 |
| Crysler | 4 | 4 |
| Denbigh | 4 | 4 |
| Gananoque | 4 | 4 |
| Iroquois | 4 | 4 |
| Manotick | 4 | 4 |
| Metcalfe | 4 | 4 |
| Navan | 4 | 4 |
| Odessa | 4 | 4 |
| Plantagenet | 4 | 4 |
| Seeleys Bay | 4 | 4 |
| South Mountain | 4 | 4 |
| Wooler | 4 | 4 |
| Adolphustown | 3 | 3 |
| Delta | 3 | 3 |
| Enterprise | 3 | 3 |
| Gilmour | 3 | 3 |
| Harrowsmith | 3 | 3 |
| Ingleside | 3 | 3 |
| Inverary | 3 | 3 |
| L'Orignal | 3 | 3 |
| Lancaster | 3 | 3 |
| Maxville | 3 | 3 |
| North Gower | 3 | 3 |
| Osgoode | 3 | 3 |
| Saint-Régis | 3 | 3 |
| Selby | 3 | 3 |
| St Isidore de Prescott | 3 | 3 |
| Sydenham | 3 | 3 |
| Tamworth | 3 | 3 |
| Thurlow | 3 | 3 |
| Williamsburg | 3 | 3 |
| Wolfe Island | 3 | 3 |
| Avonmore | 2 | 2 |
| Cardinal | 2 | 2 |
| Chalk River | 2 | 2 |
| Cobden | 2 | 2 |
| Deep River | 2 | 2 |
| Eganville | 2 | 2 |
| Elgin | 2 | 2 |
| Finch | 2 | 2 |
| Glen Robertson | 2 | 2 |
| Long Sault | 2 | 2 |
| Martintown | 2 | 2 |
| Newburgh | 2 | 2 |
| St Eugene | 2 | 2 |
| Verona | 2 | 2 |
| Yarker | 2 | 2 |
| Athens | 1 | 1 |
| Barry's Bay | 1 | 1 |
| Calabogie | 1 | 1 |
| Killaloe | 1 | 1 |
| Lanark | 1 | 1 |
| North Augusta | 1 | 1 |
| Petawawa | 1 | 1 |
| Portland | 1 | 1 |
| Prescott | 1 | 1 |
| Renfrew | 1 | 1 |
| Rolphton | 1 | 1 |
| Sharbot Lake | 1 | 1 |
| Westport | 1 | 1 |
| Whitney | 1 | 1 |
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.
343 now shares its territory with 753. Because of this overlay, local calls in this region must be dialed with all ten digits.
Area code 343 is a North American Numbering Plan (NANP) telephone area code assigned to Ontario, Canada. It is one of 19 area codes serving Ontario. 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. 343 is an active North American Numbering Plan (NANP) area code, currently assigned to Ontario, Canada. It is safe to answer or dial calls using this area code.
Area code 343 covers 116 cities and communities in Ontario, including Adolphustown, Alexandria, Alfred, Almonte, Arden, and 111 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 343 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 343 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Ontario, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 343 + 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 1 343 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 343 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +13435550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.