If I am calling to any 2G or 3G recipient or receiving a call, an unknown data connection is initiated after a voice call starts. The data connection ends when the voice call is terminated. I see two calls (voice and data to internet configuration) in the log then. Voice call may be incoming OR outgoing, but the data call is always outgoing. The call produces data transfer at the provider.
Is this possible to know, which application initiates the data call?
What is a purpose of the data connection during voice call even if I am calling to a device without any data capabilities?
Or is this one of installed apps spying on me?
What the hell is going on on my phone?
I have this problem since 2 two weeks, but i have no idea what i or someone else have/has changed on the phone to create this problem!!!???
Many thanks for urgent help!