Can't receive calls on iPhone 5s?

What happened was my friend was calling me and when I found out that she did call me it didn't leave any notification, no missed calls. When I called her it worked fine but when she started calling me it said 'the person your trying to reach is currently unavailable' and when straight onto voicemail that I sent, when I didn't even put it on voicemail?! I've tried everything, turning off 'do not disturb' and also the 'airplane mode trick', nothing seems to work.

Is it possible that you have put her name in the Have you ever tried someone else, same thing happened or only for her?

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