Yeah that’s level 1. Then you can use TOR to hide your IP if you’re being super careful, and add autodelete rules to your channels. 

clownworld

Done! but one tip: you might got a number that was used for spam before if you are unlucky, which might lead to your Telegram account being flagged as a spam account, other than that, not much big issues.

privacy

How to privately/anonymously use Telegram?

Signal312

Easy steps: 

1. choose any number here https://sms4sats.com/
2. use that number to register on telegram

Done! but one tip: you might got a number that was used for spam before if you are unlucky, which might lead to your Telegram account being flagged as a spam account, other than that, not much big issues.