Well, that's the advantage of Telegram, it has the option to hide your number and even your real name, it works similar to WHATSAPP, but has better features, like the ones I just mentioned, so I prefer Telegram, in the case of looking to talk to people from elsewhere, and if that's the best of being able to talk outside the platform, of things that we shy away from saying here.
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I use Threema for that purpose, a messaging app where no numbers or names are passed on. It's a paid app though so only those with a high sense of security tend to want to pay for it. Threema uses a user code to link connections and it pretty secure, so there's no risk of compromised phone numbers and names.