Help Edit number before calling.

Hi there, I'm trying to add a number to the beginning of a number in my call list - i found the number for a company i need to call online; the method used to display the number meant that i could only call a fraction of that number i.e. (0) 999 99999 (tapping the number transferred only the '9' section to my call list).

Now, i only want to add a zero to the beginning of this number and the 'edit number before call' option does not allow me to navigate within the number only delete and add to the end. This is a basic call function that my first mobile, bought 1990, enabled me todo.

Does anyone know if the is a way of doing this without adding the number to my phonebook?