Task: On the Contacts+ app, edit an existing contact.
Steps:
Click on the contact name, Rahul Sharma.
Click on the edit icon in the top-right corner of the screen.
Click on the Add Phone option.
Click on the cross on the right side of the screen.
Click on the Add phone. 
Type 1100223344 as the edited number.
Click on the tick icon in the top-right corner of the screen.