First you use that Betacraft launcher.
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You can use Tuta Mail to make a disposable email:
https://tuta.com/Verify the email + skip the Disc0rd tips / tutorial by dismissing the orange glowing exclamation points…
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I don't think you have to download Disc0rd to use Dis0ord, but you can use Disc0rd on your browser. Make a throwaway Disc0rd with that Tuta Mail and join the Alpha Place server fbi.gov under v General Chats & #cracked-user-whitelist.
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Submit a name from namemc.com
https://namemc.com/The name you submit under the Whitelist -might- already be taken, so you might have to check with a mod like GG (gavin) or Windows7Ultimate or Noggisoggi later to get whitelisted.
Whitelisting could take 1 or 3 days, so be patient.
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Voilà, you can play Minecraft Alpha without giving a phone number!