Why does my iPhone 4 keeps making calls, starting facetime on its own (The iOS is 7.2)?

[iMore Question]

iphone-4 keeps making calls, starting facetime on its own. The iOS is 7.2

What needs to be replaced?

 

[qbnkelt]

Re: iphone-4 keeps making calls, starting facetime on its own. The iOS is 7.2

Do you mean it's sitting on a table and suddenly makes a call? I'd take it to an Apple store if a device reboot doesn't get rid of the problem.