If you are unable to connect to iTunes here are some things to try:
- Make sure your iOS operating system is up to date (Settings > General > Software Update).
- Make sure your date, time and time zone are correct on your device (Settings > General > Date & Time).
- Check your device restrictions (Settings > General > Restrictions).
- Check and verify that you're in range of a WiFi router or base station. If you're on a device with cellular service, make sure that cellular data is turned on.
- Try resetting (turn off and on) your wireless router.
- Sign out of your ID (Settings > iTunes & App Store).
- Reset your device's wireless settings (Settings > General > Reset > Reset Network Settings).
- Reconfigure wireless settings on your device.
- Without signing in, try and make a purchase (it should prompt you to sign in again at this point).
- Go to 'Settings'.
- Scroll down to 'Safari'.
- Scroll Down and tap on 'Clear Cookies and Data'.
- Tap on 'Clear Cookies and Data'.