If you don't already have an account and want to upgrade to Betternet Premium on your Android device, click on Go Premium in the Android app.
Next, select the subscription cadence, either yearly or monthly, then click on Continue.
If you have a card already added to Google Play, you can select that card and click on Subscribe. Otherwise, you will be asked to select a payment method to use for the purchase.
Congratulations! You now have all the benefits Betternet Premium has to offer, such as a larger selection of servers, premium servers, no ads, and no data cap.