Why my Iphone 4s is not displaying incoming call?

I have got 4s factory unlocked ios 7.0.4. The problem seems that it is not displaying any call at all but i still hear ringing but nothing displays on 4s. So any help to fix it?

Your Phone is old and outdated, iPhones break when they are old and outdated. Now you don't have to but if you want to… You can try a cheap android Phone okay? Now the only other choice is to buy a new and expensive iPhone 5. My android Phone has lasted me 4 1/2 years and it's still working. Just try okay?

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