There are two methods through Which You Can get Spotify Premium For Free. The First One is through Mods that I mentioned in this Post Which is Only Working if Download the Working One and From Trusted Site Otherwise it doesn't Work and the Second One is Trail.
We all know that Spotify is Given First Month Trail and Now it is Extended to 90 days. But for this, You have to Enter Your Credit Card Details and if You have then You Can get Premium Version Genuinely. And If You didn't have a Credit card then You Can Use Bin but at Your Work Risk.