How do I backup my contacts that are on an excel file into my nexus 5 phone? I have all my contacts saved in an excel file with name and phone number headers :)
Does anyone know how can I restore them into my new nexus 5 phone ?
Check its format 
If .CSV
Put that .CSV file into your SD-Card or internal then. 
1. Go to contact > Menu 


Import from storage 
Select that .CSVfile 
Then it automatically scan and add them to your contact list.