To reset factory settings of Alcatel One Touch 5015D do the following:
Turn off the phone
Press and hold both "Volume +" and "Power"
As soon as you see the logo One touch release button power on and continue holding "Volume +"
After the appearance of the list of languages release the button "Volume +"
The volume buttons, select "English" and confirm with the button "Power"
You will get to the factory recovery menu
Buttons "Volume +" and "Volume -" to select "wipe data/factory reset" and confirm your selection by "Power"
Select "Yes -- delete all user data" confirm with the button "Power"
Select "reboot system now"