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Proper Telegram Bots (https://core.telegram.org/bots/) don't have access to your phone number.

Maybe you added an account (that did not end in @xxxxbot) that was running on a custom backend.

That could have been the case. A friend of mine kept adding lots of bots to the group until several of us started getting random spam messages the next day.

How is @xxxbot enforced? I see in that article they have an official "BotFather" which doesnt seem to follow that rule.

When you register a bot it has to end in ...bot, so any account that pretends to be one is easy to spot.

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