If you no longer want to receive text messages or phone calls from a contact, you can block their number on your device. This however does not prevent the contact from leaving voicemails.
Familiarize yourself with the process of charging your device with a cable by reviewing this Interactive Tutorial. Inspect your charging cable for any signs of damage before attempting to charge your device.
Airplane mode turns off cellular, Wi-Fi, and Bluetooth connections. (Note: You can manually turn Wi-Fi or Bluetooth back on while airplane mode is active.)