Prestashop Customization

Prestashop 1.5 Back Office Customization 1) Replace search by customer name with seach by contact number Orders > create order Search Customers: ********************* "Search a customer by entering phone number" *Remarks: Must be able to search both Home number and Mobile number 2) Make the following changes to the add new customer screen in backend. Add new customer - make "First Name" non-compulsory - replace email address with phone number