Should i text him again? He didnt reply the first time...?

Ok SO i texted my crush like 4 days ago (just "hey" ) and i never got a reply. I know he hasnt lost his phone or anything like that, since he's been texting a mutual friend. So uh.. what do I do lol? Should i text him again? And if so what should I say? I dont want to be annoying! Its summer now so no school, so I probably wont be seeing him anytime soon. Also, we're both in highschool. 10 points best answer :)