If you’re like most people, you probably use your iPhone to make and receive calls. But if you’re using an iPhone 4s, there’s a good chance that someone is trying to call you without your permission. To prevent this from happening, follow these steps:

  1. Open the Settings app and select the Call Block option.
  2. Enter the phone number of the person you want to call and press OK.
  3. The phone will block all calls for that number for the rest of the day or until you change your mind.