| Prefix | Region | % Correct |
|---|---|---|
| +1 | Canada + United States | 93%
|
| +44 | United Kingdom | 48%
|
| +49 | Germany | 34%
|
| +33 | France | 31%
|
| +34 | Spain | 28%
|
| +55 | Brazil | 24%
|
| +45 | Denmark | 24%
|
| +44 1624 | Isle of Man | 24%
|
| +44 1534 | Jersey | 24%
|
| +41 | Switzerland | 24%
|
| +61 | Australia | 21%
|
| +39 | Italy | 21%
|
| +31 | Netherlands | 21%
|
| +47 | Norway | 21%
|
| +48 | Poland | 21%
|
| +46 | Sweden | 21%
|
| +54 | Argentina | 17%
|
| +43 | Austria | 17%
|
| +32 | Belgium | 17%
|
| +20 | Egypt | 17%
|
| +30 | Greece | 17%
|
| +51 | Peru | 17%
|
| +7 | Russia + Kazakhstan | 17%
|
| +56 | Chile | 14%
|
| +57 | Colombia | 14%
|
| +350 | Gibraltar | 14%
|
| +353 | Ireland | 14%
|
| +352 | Luxembourg | 14%
|
| +52 | Mexico | 14%
|
| +39 0549 | San Marino | 14%
|
| +82 | South Korea | 14%
|
| +971 | United Arab Emirates | 14%
|
| +420 | Czech Republic | 10%
|
| +372 | Estonia | 10%
|
| +358 | Finland | 10%
|
| +36 | Hungary | 10%
|
| +91 | India | 10%
|
| +81 | Japan | 10%
|
| +371 | Latvia | 10%
|
| +423 | Liechtenstein | 10%
|
| +370 | Lithuania | 10%
|
| +351 | Portugal | 10%
|
| +40 | Romania | 10%
|
| +27 | South Africa | 10%
|
| +216 | Tunisia | 10%
|
| +90 | Turkey | 10%
|
| +1 340 | United States Virgin Islands | 10%
|
| +93 | Afghanistan | 7%
|
| +358 18 | Åland | 7%
|
| +1 684 | American Samoa | 7%
|
| +351 292 | Azores | 7%
|
| +351 295 | Azores | 7%
|
| +351 296 | Azores | 7%
|
| +1 441 | Bermuda | 7%
|
| +591 | Bolivia | 7%
|
| +359 | Bulgaria | 7%
|
| +385 | Croatia | 7%
|
| +1 809 | Dominican Republic | 7%
|
| +1 829 | Dominican Republic | 7%
|
| +1 849 | Dominican Republic | 7%
|
| +593 | Ecuador | 7%
|
| +298 | Faroe Islands | 7%
|
| +299 | Greenland | 7%
|
| +1 671 | Guam | 7%
|
| +1 808 | Hawaii | 7%
|
| +852 | Hong Kong | 7%
|
| +354 | Iceland | 7%
|
| +62 | Indonesia | 7%
|
| +972 | Israel + Palestine | 7%
|
| +853 | Macau | 7%
|
| +351 291 | Madeira | 7%
|
| +60 | Malaysia | 7%
|
| +234 | Nigeria | 7%
|
| +1 670 | Northern Mariana Islands | 7%
|
| +92 | Pakistan | 7%
|
| +63 | Philippines | 7%
|
| +1 787 | Puerto Rico | 7%
|
| +1 939 | Puerto Rico | 7%
|
| +974 | Qatar | 7%
|
| +262 | Réunion + Mayotte | 7%
|
| +221 | Senegal | 7%
|
| +421 | Slovakia | 7%
|
| +886 | Taiwan | 7%
|
| +380 | Ukraine | 7%
|
| +355 | Albania | 3%
|
| +376 | Andorra | 3%
|
| +880 | Bangladesh | 3%
|
| +975 | Bhutan | 3%
|
| +267 | Botswana | 3%
|
| +855 | Cambodia | 3%
|
| +61 8 9164 | Christmas Island | 3%
|
| +61 8 9162 | Cocos Islands | 3%
|
| +506 | Costa Rica | 3%
|
| +599 9 | Curaçao | 3%
|
| +268 | Eswatini | 3%
|
| +500 | Falkland Islands + South Georgia and the South Sandwich Islands | 3%
|
| +233 | Ghana | 3%
|
| +590 | Guadeloupe | 3%
|
| +502 | Guatemala | 3%
|
| +962 | Jordan | 3%
|
| +254 | Kenya | 3%
|
| +996 | Kyrgyzstan | 3%
|
| +856 | Laos | 3%
|
| +961 | Lebanon | 3%
|
| +266 | Lesotho | 3%
|
| +261 | Madagascar | 3%
|
| +223 | Mali | 3%
|
| +356 | Malta | 3%
|
| +596 | Martinique | 3%
|
| +377 | Monaco | 3%
|
| +976 | Mongolia | 3%
|
| +382 | Montenegro | 3%
|
| +687 | New Caledonia | 3%
|
| +64 | New Zealand + Pitcairn Islands | 3%
|
| +389 | North Macedonia | 3%
|
| +970 | Palestine | 3%
|
| +507 | Panama | 3%
|
| +250 | Rwanda | 3%
|
| +378 | San Marino | 3%
|
| +239 | São Tomé and Príncipe | 3%
|
| +381 | Serbia | 3%
|
| +65 | Singapore | 3%
|
| +386 | Slovenia | 3%
|
| +94 | Sri Lanka | 3%
|
| +255 | Tanzania | 3%
|
| +66 | Thailand | 3%
|
| +256 | Uganda | 3%
|
| +598 | Uruguay | 3%
|