Hard Reset I9500 Galaxy S4

To Hard Reset the Galaxy S4 do the following.

With the Phone off Hit and Hold the Home key, Volume Up Key and then hold down the Power Key, the Phone should then Vibrate to say its powering on. At that point you can release the Power Key but remain holding the Home and Volume keys. You should then be presented with the Android reset menu. Black screen with blue writing.

Use the Volume keys to move up and down the menu and use the Power button to select your option.

If you want to do a reset with the phone on the same can be achieved with the settings menu. Go to the following option:
Settings-Accounts Tab - Backup and Reset - Factory data reset.  

Setup Call Divert and Call Waiting

Call Diverting lets you redirect incoming calls to another mobile or land line number. Operator costs will most likely apply.

To activate these you need to dial and call them on the phones keypad.

To Divert Unanswered calls ie. When your mobile rings out.  **61*The number you want to divert to #


This will allow you time to answer the call but if you are unavailable will let it go to another phone.
To Deactivate it is ##61#

When the Phone is turned off : **62*The number you want to divert to#
To Deactivate it is ##62#

When you are on another Call: **67*The number you want to divert to#
To Deactivate it is ##67#

To Divert all Call Types it is: **21* The number you want to divert to#
To Deactivate it is ##21#

To Setup Call Waiting again dial the following in to the phones keypad and dial it.
Call Waiting on: *43#
Call Waiting off: #43#
Check Call Waiting Status: *#43#