Would that be better and cheaper to use than the app?
You have to pay something if you want to watch Netflix. Do not understand the question completely. Download the app and log in to your account
What does one have to do with the other? You look in the app, regardless of which account that runs.
The app is definitely needed to use Netflix on the phone.
With the account data, you log into the ensprechende account.
Where is the account i have none
Yes and where can I get the access data?
By signing up and paying for it - unless someone lets you in on his account.