Max-Zorin Ok thanks. I installed WhatsApp now in a separate profile with VPN always on and gave it only network, contacts (no problem in the separate profile) and microphone for being able to send voice messages. Should be pretty ok. The only thing they probably still can steal is the timezone because I assume that this is publicly available to all apps and also cannot be changed on a per profile basis but only for the whole smartphone. This might not be relevant if you're always in the same timezone, but for me it would be a nice feature to fake this because I am switching more or less frequently.