How to analyze application traffic on Android?

Question

Android

The AlfaStrakhovanie Android application ate 1GB of traffic in the background in 2 weeks.
That is, the application never opened at all, but the traffic flew away.
It seems to me that this is a very strange behavior, so I wonder what AlphaInsurance now knows about me based on this data.
How can I find out exactly what data the application sends?

Answer 1

This application (like all other banking ones from Sberbank, VTB, etc.) has access to SMS, geolocation, file storage, and more.
App permissions:
Calendar
add or modify calendar events and send email to guests without owners' knowledge
read calendar events plus confidential information
Storage
modify or delete the contents of your USB storage
read the contents of your USB storage
Microphone
record audio
Device ID and call data
read phone status and identity
Phone number
read phone status and identity
Wi
-Fi connection details view Wi-Fi connections
Photos/media/files
modify or delete the contents of your USB storage
read the contents of your USB storage
Location
precise location (GPS and network-based)
approximate location (network-based)
Camera
take pictures and videos
Other
download files without notification
receive data from Internet
pair with Bluetooth devices
change network connectivity
run at startup
view network connections
access Bluetooth settings
prevent device from sleeping
change your audio settings
connect and disconnect from Wi-Fi
read Google service configuration
full network access
Therefore, it merges all the data that it can only reach: sms, photos, geolocation, recording from a microphone ...
It makes no sense to analyze traffic - everything is clear.
All banking applications must be deleted from the phone and never installed.