All of them didn't know the dialing Codes of all the countries.So,here I mentioned some of the" International Dial Codes with State Wise", which i know.
Afghanistan +93
Albania +355
Algeria +213
Andorra +376
Angola +244
Argentina +54
Armenia +374
Australia +61
Austria +43
Azerbaigan +994
Bahrain +973
Bangladesh +880
Belarus +375
Belgium +32
Bolivia +591
Bosnia +387
Brazil +55
Bulgaria +359
Cameroon +237
Canada +1
Chad +235
Chile +56
China[People's Republic] +86
Colombia +57
Congo +242
Costa Rica +506
Croatia +385
Cuba +53
Cyprus +357
Czech Republic +420
Denmark +45
Ecuador +593
Egypt +20
El Salvador +503
Ethiopia +251
Fiji +679
Finland +358
France +33
Gabon +241
Georgia +995
Germany +49
Ghana +233
Gibraltar +350
Greece +30
Greenland +299
Herzegovina +387
Hong Kong +852
Hungary +36
Iceland +354
India +91
Indonesia +62
Iran +98
Iraq +964
Ireland +353
Italy +36
Ivory Coast +225
Japan +81
Jordan +962
Kazakhstan +7
Kenya +254
Korea +85
Kuwait +965
Laos +856
Latvia +371
Lebanon +961
Liberia +231
Libya +218
Liechtenstein +41
Lithuania +370
Luxembourg +352
Malaysia +60
Maldives +960
Mali +223
Mauritius +230
Malta +356
Mexico +52
Moldova +373
Monaco +377
Mongolia +976
Morocco +212
Mozambique +258
Myanmar +95
Namibia +264
Netherlands +31
New Caledonia +687
Nepal +977
New Zealand +64
Nigeria +234
North Korea +850
Norway +47
Oman +968
Pakistan +92
Panama +507
Paraguay +595
Peru +51
Philippines +63
Poland +48
Portugal +351
Qatar +974
Romania +40
Russia +70
Rwanda +250
Saudi Arabia +966
Senegal +221
Serbia +381
Seychelles +248
Sierra Leone +232
Singapore +65
Slovakia +421
Somalia +252
South Africa +27
Spain +34
Sri Lanka +94
Sudan +249
Sweden +46
Switzerland +41
Syria +963
Taiwan +886
Tanzania +255
Thailand +66
Tunisia +216
Turkey +90
Uganda +256
Ukraine +7
United Arab Emirates +971
United Kingdom +44
Uruguay +598
USA +1
Uzbekistan +7
Vatican City St. +39
Venezuela +58
Vietnam +84
Yemen +967
Yugoslavia +38
Zaire +243
Zambia +260
Zimbabwe +263