Can I get free rolls on DegenPhone?

You get 1 roll for subscribing to the @degenphone channel from the app. You get another for joining DegenPhone through a friend's invitation. If you own DegenPhone stickers, you also get 1 free roll a week. A roll is one try at a random +372 number and normally costs 2 GRAM.

The app uses your free rolls before your paid ones.

Use your free roll on the Mint screen. The roll is free, but keeping the number is not. If you like it, you have 15 minutes to mint it, which creates its NFT. A mint costs from 150 GRAM.