Generally, the phone, because texts are dumb at times. But they're really convenient when you don't want to have a full conversation, and when you're just bored in class. But if it's important, people REALLY need to learn that a text message does not equal to a OMGEMERGENCY!! message and will not be taken as such. "What's wrong with you, why didn't you text back?" "What happened, you didn't text me back!" Are the two most RETARDED excuses in existence. It's just... NO, YOU'RE A RETARD.