A. 1. Check app settings: Look for an option in the app settings to stay logged in or remember your login details. 2. Update the app: Ensure you are using the latest version of WienMobil, as updates may fix login issues.

B. 3. Clear app cache: Go to 'Settings' > 'General' > 'iPhone Storage', find WienMobil, and select 'Offload App' to clear cache without deleting data.