Perhaps this link can provide a lead:
https://support.discordapp.com/hc/en-us ... one-Number
I have never had the question for phone number but I only visit on desktop.
GlovedYankee wrote: ↑Tue Jun 16, 2020 8:17 pm I just sent private message invites to you both, need to be redeemed within 24 hrs please.
Enjoy!