Can anyone give me any tips on how to get me boy friend to call for me?

well were boh still at school, (over 13) and we live around 30 seconds away, but the unfortunate thing is how do i get him to call for me, i dont see him around the streets and i don't go to the same school his phone is dead because he has lost the charger, and he will think im a pain just calling for him all the time. so please help