displays question mark (??) instead of text

I had a website (PHP-MySQL) and I moved on, from one hosting company to another one. My previous host, gave to me, the mysql database with latin1_swedish_ci collation. My native language is greek and the content displays like ???? . Additionally, when I m trying to save some text, some characters saved like ???? . Now, I would like two things: 1) Fix the encoding to UTF-8 2) Display and save all of the text without question marks (???)