Criminals could use such a service to target unsuspecting users. To make matters worse, Bambenek said it would be quite easy for someone to develop a method of determining whether a user has installed Telegram on their mobile device. But you cannot block others from seeing if you have Telegram installed if they know your mobile number. And you can choose whether everybody or just your existing contacts can join you to group chats.
You can choose who can see when you were last active on Telegram. That’s annoying, but surely there’s a way of blocking others from seeing you have Telegram installed, right? Those include Telegram, which has versions for Android and iOS. “Do Not Call” rules don’t apply to encrypted messaging apps. Mobile applications that block unwanted calls build their registries off this reputation data. These records reflect the complaints users have filed on phone number reputation sites. Most of us know there are there “Do Not Call” rules that help prevent unwanted (spam) calls. What’s going on here? How is this even possible? Likewise, if you have scammers’ numbers in your contact list for some reason, you will get push notifications when they join Telegram…” “Here’s the deal: If a scammer signs up for Telegram and already has your phone number in their contact list, it will also notify them that you also have Telegram. So in addition to connecting you to your friends and contacts, the app will also connect scammers directly to you. In a blog post, Fidelis Cybersecurity researcher John Bambenek discusses the ease with which scammers can reach out to Telegram users: Scammers can use the Telegram mobile messaging app to connect with a potential victim if they already have their phone number in their contact list.
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