LinkedIn makes more money selling your data, than the job posting fees.
Even if your full real name is on LinkedIn, you want to avoid giving them your SIM card's real underlying phone number. Because then you're handing over to all these aggregated cross-service data brokers, what other services (that aren't in your real name) you sign up for, and what you do on those.
And you're handing over to the government, the full metadata of where you are 24/7, who you're standing near, and who you talk to and what you say on that number.
But LinkedIn will reject VoIP numbers, and most "crypto confirm" services will be detected. Because they buy a block of numbers, and are often labeled "landline" on APIs.
That's why I'm so excited about the new P2P SMS Exchange we made (Simplified Privacy). Not only does it filter out sellers using VoIP with multiple API checks, but the numbers appear to services (such as LinkedIn) as a random number. There is no relationship between one seller's number and another.
Try it out for Monero or Bitcoin Lightning,
Crypto SMS Verify | Simplified Privacy