Blocking texts and calls on iPhone 4S?

Ok so I would like this one guy to stop calling and texting me but I've heard you can't block calls on iPhone but I really want him to leave me alone! And my iPhone is not jail broken and I do not really want to jail break it but I just want to block this one guy from calling and texting me so anything I could do? And I don't want to have to pay for anything

You could call your carrier and ask them to block the number. I believe there are also apps you can get that will block calls and texts from certain numbers.