There's data providers that sell this info. If you didn't put it on LinkedIn, the spam callers got it through different ways (sales tooling, direct from data p

There's data providers that sell this info. If you didn't put it on LinkedIn, the spam callers got it through different ways (sales tooling, direct from data providers, leaks, etc.) If you're putting your phone number out anywhere (even in the signature of your email), they're collecting that info and selling it