You can use an anonymous SMS verification service that accepts Bitcoin e.g. JuicySMS.com, SMSPVA.com or TextVerified.com. You can even use an Android emulator like Anbox or Android-x86 to signup, then connect it to Telegram Web or Telegram Desktop.
Additionally, the 10 newest listings are displayed in this P2P marketplace aggregator: https://anarkio.codeberg.page/markets/ But you would still need a Telegram account in order to contact the seller.
There are almost 1000 people in the P2P marketplace group & daily listings, as well as other good Bitcoin-related channels, so it may be useful to make an anonymous Telegram account.
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Jumping through hoops to access the service is not the only problem with centralized services. Here's another problem: https://en.wikipedia.org/wiki/Government_censorship_of_Telegram_Messenger
There are almost 1000 people in the P2P marketplace group & daily listings, as well as other good Bitcoin-related channels, so it may be useful
Indeed, the worse the platform, the more users it has. I bet you can get even more people on Facebook and Discord.
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It's possible to access Telegram via Tor (e.g. in-app proxy settings, Orbot or use Anbox in Whonix Workstation).
Signal has the same problems (phone number requirement & even more difficult to access without a phone: https://anarkio.codeberg.page/#/7560cf4a7685/11). Didn't test if Briar/Session work in Whonix yet.
Otherwise there is a (less active) P2P marketplace in Matrix: https://matrix.to/#/#cryptomarketplace:matrix.org
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