Is it possible to wiretap a telephone conversation based on android?

Question

Android

This is not about wiretapping by special services, with any special equipment or bugs, but about the availability of a technical capability by means of API and software to transmit sound data to another subscriber or to a server.
I didn’t do mobile development myself, so I’m interested in you - specialists)
The first thing that came to mind was recording sound from a microphone to a file and then transferring it to a server when connected to Wi-Fi.
Are there other ways? Is it possible to hide the application (in addition to replacing the icon), for example, installing software as a system service. Methods of detection, excluding, of course, a disassembler)) An
acquaintance complained that they were somehow listening to him. Paranoia, in a word) But it became interesting to figure out for myself the technical side of things)

Answer 1

Yes, perhaps even on symbian so indulged.

Answer 2

On Android without root, in the general case, it will not be possible to implement this. That is, theoretically, you can write something, but the solution will not be massive and will work very differently on different devices.

Answer 3

You can of course, even without root. I installed a parental control program for my child, I bought it here . I put everything without root, though without it there is no recording of VKontakte, Viber and other messengers. But sms and conversations are no problem.

Answer 4

In the standard configuration, you can not listen. Only root, or third-party applications. There are many of them and each is better in some way, worse in some way. The above service is good - used it. Liked it. Now I'm testing Reptilicus for drying phones .