Subscription status and validity period cannot be checked in game, but must be checked in the respective mobile app store.
App Store
1. Tap Settings on your device
2. Tap your Apple Account
3. Check your subscription status by tapping Subscriptions
If you cannot complete the steps above:
1. Tap Settings on your device
2. Scroll down and tap iTunes & App Store
3. Tap your Apple Account
3. Check your subscription status by tapping View Apple Account > Subscriptions
Note: Display may vary depending on your OS version.
Google Play
1. Tap Play Store on your device
2. Tap the Google Account profile icon to the top-right of the Play Store
3. Under Payments and subscriptions, tap Subscriptions
4. You can check your subscription status by tapping Pokémon Trading Card Game Pocket from the Subscriptions screen