On Android, the subscription is managed by Google. You can view subscriptions following the steps below:

  1. Open the Google Play app.
  2. At the top right, tap the profile icon.
  3. Tap Payments & subscriptions and then Subscriptions.
  4. Under Subscriptions, check the list of subscriptions and you will see 2ndLine - subscription along with status.
  5. Tap the 2ndLine - subscription that you want to manage.
  6. It will display all information about available subscription plans and active subscription plans (if any) for 2ndLine.

Alternatively, tap here to learn more.

In case you opened this accidentally but want to know a similar answer for iOS, here is the article.