The best practice is to add an auto incrementing ID for each row. This would also help you a lot if, one day, you choose to use relational tables.
In phpMyAdmin, when you create (or edit) a table, you'll see the AUTO_INCREMENT
option. You can only have one column with auto IDs enabled.
Edit: This is how you database would look like:
id | name | email | phone
1 Tekin ... ...
2 John ... ...
3 Jane ... ...