Hardly ideal, but it's a start.
[1] And if you're not contributing to an open-source project, please do it, it's a great way to learn stuff, improve your CV, network and of course give back.
I tried this way-back-when and ended up submitting fixes to projects that were open source but had no real path to accepting patches from people outside the cathedral.
Or you can reach out over social media. "Hi there, I follow you on X and am just getting started in the industry. Do you mind if I ask a few research questions?" A friend of mine just used this technique to land a role in an industry where he had no contacts.
If the situation is "good luck getting through to people on the phone", then that probably means this person is not a real friend of yours, they are a stranger, and you shouldn't try. You should be reaching out to people who actually know your name, or you have a mutual friend.