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Do your other friends have iPhones? Did you switch from an iPhone to the S7? There is a common issue where people who had an iMessage account do not turn it off when they switch and have issues receiving messages. If so then you need to log back into Apple and turn off imessage.
Also, are you sure you haven't accidentally blocked your friend?
I'm really glad to hear you were eventually able to get in touch with your friend. shelbyfan has a really good suggestion that's a very common solution. Please give us a reply back and let us know if you still need some help.
Just checking in to see if you've tried the suggestion above. If so, please let us know if that helped. Thank you!