Country code +65 is Singapore.
Six hundred fifty-eight ten-thousandths.
Portugal
221 is the international dialling code for the country of Senegal.
Country code +358 is Finland.
90 is the dialling code for Turkey
No, the dialling code for Switzerland is +41.
There are many different country codes for different countries and territories in Oceania.
Dialling the UK from abroad - you would dial 0044
Yes, dialling is a variant spelling of dialing. For example, "What telephone number are you dialling?"
First you need to know what country in Europe you are trying to ring. Then you need to find its international dialling code. Once you know that you would first dial 011 and then the dialling code of the country, then the regional code within that country, usually dropping a leading zero, and finally the local number itself.
None, but there are countries with dialling codes from 350 to 359, so you will need the next digit to get an answer to your question.
Luton's dialling code is 01582.