Remove Keypad lock option from Nokia 225 4G Phone software .

Hi , I have purchased a Nokia 225 4G Keypad phone for my relative , she is an illiterate, a senior citizen and does not know how to operate the phone , but she knows to call (a phone number) by using the speed dial feature on keypad .

But the phone gets keypad locked by pressing the End call button / Power button every time , 

I have also deactivated the Auto Keyguard option , but whenever the End call button / Power button is pressed , the phone gets locked .

Is there any way to remove the Keypad lock option from the phone software itself ? , 

Any websites ?

Hoping to get an early reply and thanking you in anticipation .