GTA TLAD, Brian Dawkins' bug. Download issue (Grand Theft Auto 4)

After the telephone mission of Stubbs, where it is necessary to put a bug in Infernus, we are given the contact of the bug itself, by calling which you can hear what is actually happening in the car. There are 7 such calls in total.

But there is a problem.
1) If it is saved before a text message with a bug number, and then loaded, there will never be a message, and a contact too. Numerical dialing will not bring any result.
2) If it also loads at least once, but already with an existing contact, there will always be only beeps.

Actually, what conclusion did I come to - if you want to listen to all unique calls, then you need to do it in one game session, you can save it, but you can't load it.

I also raised a topic on the form with a secret call to Kate at the end of the game (which I could not get) - perhaps scripts work there using exactly the same system.

On the Internet, information on these points, as always, is 0, even though it will be here.