Why can't I receive or see text messages?

Hi, I've been having this problem with my sms on LG Optimus L70. I've can text my friend who has an iPhone but, I can't receive his messages but I can send. I can't see his texts or get any notifications. He says that he sent them I've seen it be done but, I still can't see them. My sister has an iPhone and I can text her fine, not sure why I can't text him. I can also text other androids but why can't I see his text? (kik uses too much data for him.) Thanks (-:

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