Contact Us


Users in the United States can reach the PHT Support Center at 800-PHT-KNOW (800-748-5669). International users, please consult the table below

Country Number
Argentina0800 444 0962
Armenia+1 617 681 6306
Australia1 800 800 051
Austria0800 100 405
Belgium (English)0800 58 016 (English)
Belgium (French)0800 71 076 (French)
Belgium (German)0800 71 113 (German)
Brazil0800 891 5909
Bosnia+1 617 681 6306
Bulgaria00800 0010, then 866 245 4931
Canada1 800 PHT KNOW
Chile 123 0020 3408
China NetCom (North) 1 0800 74 40 164
China Telecom (South) 1 0800 44 00 158
Colombia01 800 911 0010, then 866 310 3707
Costa Rica0800 013 1210
Croatia0800 222 953
Czech Republic 800 142 150
Denmark80 60 00 09
Egypt02 510 0200, then 866 310 3707
El Salvador+1 617 681 6306
Estonia800 00 44 154
Finland0800 11 6366
France0800 10 19 79
Germany0800 101 28 21
Greece00 800 1311, then 866 310 3707
Guatemala1 800 624 0079
Hong Kong3002 1665
Hungary06 800 14 571
Iceland800 8544
India000 800 440 1125
Indonesia008 800 330 334
Ireland1 800 946 700
Israel1 809 470 062
Italy800 90 56 37
Latvia8000 2151
Lithuania8800 30207
Malaysia1800 80 59 71
Mexico (English)001 800 PHT KNOW (English)
Mexico (Spanish)001 855 631 6952 (Spanish)
Netherlands0800 023 1389
New Zealand0800 110 178
Norway800 62 051
Pakistan00 800 0100, then 866 237 9767
Panama001 800 201 3095
Peru0800 5 0974
Philippines1 800 1116 0651
Poland00800 331 1262
Portugal800 206 172
Puerto Rico (US Territory) 1 800 PHT KNOW
Romania0800 894492
Russia (Primary - Toll Free)8 10 800 249 13011
Russia (Within Moscow) 363-2400, then 866 310 3707
Russia (Outside Moscow) 8^(495) 363-2400, then 866 310 3707
Russia (Within St. Petersburg) 363-2400, then 866 310 3707
Russia (Outside St. Petersburg) 8^(495) 363-2400, then 866 310 3707
Saudi Arabia+1 617 681 6306
Serbia+1 617 973 1739
Singapore800 616 30 03
Slovakia0800 0044 65
Slovenia+1 617 681 6306
South Africa 0800 99 5853
South Korea00308 33 00 08
Spain900 90 2541
Sweden020 120 99 69
Switzerland (English)0800 199 325 (English)
Switzerland (French)0800 891 183 (French)
Switzerland (German)0800 891 025 (German)
Taiwan00801 33 33 42
Thailand1 800 33 140 353
Tunisia+1 617 681 6306
Turkey00 800 151 1335
Ukraine*0^00 11, then 866 245 4931
United Kingdom0800 015 0408
United States1 800 PHT KNOW
United States (Backup) 1 877 PHT KNOW
Venezuela (English)0 800 552 6288 , then 866 310 3707 (English)
Venezuela (Spanish)0 800 100 3063 (Spanish)

800-PHT-KNOW = 800-748-5669
*The character '^' indicates that the user may need to await a second dial tone at that point of the dial string.