Where Does the Blau App Store Data?
The Telefonica Blau app keeps prepaid balance in private storage on Android and iOS. Balance syncs from servers after login.
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Blau.de runs under Telefonica IDs with meinblau branding per platform. Private storage holds login session plus prepaid cache. Top ups apply server side regardless of local files. The location matters because the session keeps balance visible. Cached counters build up with use.
iOS adds a per install GUID with a com.telefonica bundle twin. Keep login ready before switching phones. Clearing cache can settle stale balance bars. Full storage clear logs you out. Credit stays server side. Check balance inside the app after relogin.
Where Mein Blau stores this, by platform
/data/data/telefonica.de.blau
Private session and balance cache for the verified Blau Android package. Credit syncs from servers; local holds tokens.
/var/mobile/Containers/Data/Application/<guid>/Documents
GUID container for the iOS twin bundle (App Store ID 1119566525). Note the string differs from Android.
Frequently asked questions
Does Blau credit survive reinstall?
No. Balance and options sync from Blau servers after login. Local data holds session and cached counters. Reinstall and sign back in. Keep login ready. Top ups apply server side.
How do I fix stale Blau balance?
Clear cache from system settings for stale balance bars. Full storage clear logs you out. Credit itself stays server side. Check balance inside the app after relogin. Keep login ready.
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