1SUM is a public Telegram group — anyone can join without invitation. Your phone number is never visible to other members unless you've made it public in your Telegram privacy settings. You can leave at any time with a single tap.

No. Telegram never notifies your contacts when you join or leave a group. Other members inside 1SUM can see your username only if you post — your membership is not visible to anyone outside the group.

1SUM is a Telegram group for anyone interested in business and information. Members can expect regular discussions on moscow and services, along with contact to dive into.

We verify every listing is publicly accessible, has a minimum member count, and exclude groups Telegram has marked as harmful. 1SUM currently has 165 members, last verified 25 May 2026. If you've joined 1SUM and noticed something suspicious — a review on this page helps others stay safe.