Does my contacts see I have Telegram app automatically?

[acsurfer]

Hello,

Q1. If I install Telegram app, will all my contacts (inside contact list, [contacts] button) automatically see I have Telegram installed? (I know if I installed whatsapp, all my contacts will know I have whatsapp, so I wonder if telegram is similar.)

Q2. I do not have person A phone number. Person A do not have my phone number. If person A has a telegram channel and I joined person A telegram channel, will person A know my number or will I know person A number?

Q3. How to prevent other Telegram users from knowing my phone number?

Q4. How do I know if a contact has Telegram?

Thanks.a lot.

 

[Javier P]

Hello,

Q1. If I install Telegram app, will all my contacts (inside contact list, [contacts] button) automatically see I have Telegram installed? (I know if I installed whatsapp, all my contacts will know I have whatsapp, so I wonder if telegram is similar.)

Q2. I do not have person A phone number. Person A do not have my phone number. If person A has a telegram channel and I joined person A telegram channel, will person A know my number or will I know person A number?

Q3. How to prevent other Telegram users from knowing my phone number?

Q4. How do I know if a contact has Telegram?

Thanks.a lot.

1. Only those ones that have Telegram and sync contacts enabled.

2. No, unless you share the contact.

3. They won't, unless you both share your numbers.

4. Enable sync contacts in Telegram settings.