Like most cellphones, the Apple iPhone allows you to set up a voicemail box that others can use to leave messages for you when you cannot come to the phone. You can set up your voicemail, customise it to your liking and check for new messages all from your phone itself, without having to dial or remember any phone numbers.
Click the green "Phone" icon on your iPhone. Unless you have moved it, it will appear in the bottom row of your home screen on the left side, featuring an image of a telephone.
Click the "Voicemail" tab at the bottom of the screen on the right side. Your iPhone will then automatically dial your voicemail.
Select a password for your voicemail. Your voicemail assistant will instruct you to choose a numeric password for security purposes, so choose a password that you can easily remember and dial it using the keypad. If you already have your voicemail set up but would like to change your personal options, press "4" to access the administrative options.
Record a greeting message when the voicemail assistant prompts you. This is the greeting that callers will hear when they reach your voicemail. Speak clearly, keep your greeting brief and press the "#" key when you're finished.
Review your greeting and decide if you want to keep it. If you do not like how your greeting turned out, you will hear an option allowing you to redo the greeting. You can record your greeting as many times as you want until you feel satisfied with it.
Press the red "End Call" button when you have finished. Your voicemail is ready for others to leave you a message whenever you are unavailable.