I have an IPhone 4s and everytime someone calls me, it immediately goes to my voicemail. If they call again, then I will receive the call. So basically, anyone wants to call me will have to call twice. Can anyone help?
Look at the status bar at the top of the screen. Is there a crescent moon icon? If so,you have turned on do not disturb. Go into the settings menu and turn it off. You should now receive calls normally.