He Prefers to Text & Never Call
Texting back and forth in the early stages of dating is all fine and dandy, but as you get to know each other a bit better, if you enjoy talking on the phone, he should have no problem doing that with you, at least occasionally. A man interested in your will want to separate himself from other men. He will want to make himself stand out.
Also, a man who likes or doesn't mind you calling him is less likely to be a player, especially if he almost always answers the phone when you call. There's isn't much a player hates and is probably scared of more than a girl calling him when he's with another woman.
A man who won't make an effort to call you, especially after you've expressed your desire for him to do so, is clearly not interested in building a relationship with you. A lack of effort is a lack of interest.