How to store Phone Numbers ?

Suren

you should go with Riyaz  way and its good way to fullfill your scenario .

Storing data into comma separated(,) is not a good idea.
You create columns in same table if you know the max limit of phone numbers. Generally employee phone number can be either mobile number, work Phone, home Phone, alternative number. 

But if you dont know the limit then I suggest you to create a new table to store employee's phone number, it will be easy to maintain the data future. Your new table will store data like below:

Table: [your new table]
EmployeeID        PhoneNumber
101                  3434343434
101                  4324243244