How does an upgrade to a different subscription type work?

Occasionally we might have offers for annual subscriptions at an even cheaper rate.
PLEASE NOTE: These can only be bought directly from www.babbel.com – not via an in-app purchase. If you choose to upgrade to one of these and already have a subscription with us, it will work the same way as changing a payment plan – the original subscription will be automatically cancelled and the time already paid for added on to the first payment period of the new subscription. What's more, the extra time is rounded up to a complete month.
Here's an example:
You currently have a three-monthly subscription and the next payment is due in five weeks time.
You upgrade to an annual subscription.
We will convert the five weeks already paid for into two months and add these on to the first payment period of the new subscription.

PLEASE NOTE:
If your original subscription was bought via the Apple App Store or the Google Play Store, it's very important that you cancel this to avoid any further charges.