When I started my last job (decently large corp) there was a long onboarding session for mobile device setup. Email, Skype, a dozen other internal apps, 2FA authenticator, SSO, device profiles, remote locking/erase, certificates — the whole deal. There was even some weird internal app store. I asked them where I could get my company phone to set up all this, and they replied no, you just use your personal phone. I have never been more amused/horrified than at that moment.

I eventually escalated a few levels and was able to get them to buy me one, but I was also presumably the first person who asked so strongly.