The Complete Guide to Telegram Advanced Features and Privacy Settings
From Secret Chat and self-destruct messages to building groups and channels, bots and large file transfers, plus a checklist for the most secure privacy setup.

How do you use Telegram? What should a first-time user set up?
For your first time on Telegram, set up these things first: (1) install only from this site telegrammessage.com, the App Store, or Google Play, never a sketchy build;
(2) register with a real mobile number (international format; for Taiwan use +886 and drop the leading 0), and log in with the code; (3) since April 2026 the app ships with built-in Simplified and Traditional Chinese, so after updating to the latest version pick Simplified or Traditional under Settings > Language; (4) turn on two-step verification and link a recovery email to add a password layer to your account; (5) under Privacy and Security, hide your phone number and last-seen time from strangers. Set these few items and you can basically use it safely and smoothly.
How do you set self-destruct messages in Telegram? Can sent messages auto-vanish?
Telegram self-destruct can make messages vanish automatically in two ways: one is to open a Secret Chat and set a self-destruct timer in the chat, after which the message destroys itself by your set time once the other person reads it;
the other is Auto-Delete in regular chats: open a conversation, tap the other person name > turn on Auto-Delete, and choose to clear automatically after 1 day, 1 week, or 1 month (deleted on both sides). The former is more about privacy and per-message self-destruct; the latter is timed cleanup of a whole conversation. Note that Auto-Delete in a regular group is a setting that applies to everyone. The exact entry varies slightly by version, so look for the Auto-Delete wording in your interface.

How do you start a Secret Chat in Telegram? Why can I not find the entry?
The entry to start a Telegram Secret Chat is on the other person profile page: open the chat with them > tap their avatar/name at the top to enter the profile > tap the three-dot or More menu at the top right > choose Start Secret Chat.
Common reasons you cannot find it: (1) Secret Chats can only be started on the mobile app (iOS/Android); the desktop and web versions do not support them, so you will not see this option on a PC; (2) the other person must be online, since a Secret Chat needs both devices to establish an encrypted session directly; (3) it works only one-on-one with a contact, not in groups. Switch to your phone and act on a single contact and you will find it.
How do you tune Telegram privacy settings for maximum safety? Any recommended checklist?
Telegram recommends this privacy checklist, adjusted item by item under Settings > Privacy and Security: (1) Phone Number > visible to Nobody, and Who can find me by number set to My Contacts; (2) Last Seen > Nobody;
(3) Profile photo and bio > My Contacts or Nobody; (4) Who can add me to groups > My Contacts, to block strangers from pulling you into groups; (5) turn on two-step verification and link a recovery email; (6) use Secret Chats for sensitive conversations; (7) check Active Sessions periodically and kick out sessions you do not recognize. This setup balances privacy and usability, works for everyone, and every menu item maps cleanly to the labels in your interface.
How do you delete a Telegram account? Will chat history be removed too?
Deleting your account permanently erases your chat history, contacts, and group memberships along with it, and it cannot be recovered.
Two ways: (1) in the app, under Settings > Privacy and Security > If Away For, you can set the account to delete itself automatically after a period of inactivity (for example, auto-delete after 1/3/6/12 months without logging in); (2) to delete immediately, open Telegram official account deactivation page in a browser (the deactivate page at my.telegram.org), log in with an SMS code on your number, and confirm the deletion. After deletion your records here are wiped, but messages you sent to others may still remain on their side. Think it through before deleting, because it cannot be undone.
How do you send files in Telegram? Is there a size limit for large files?
To send a file: in the chat box tap the paperclip/attachment icon > choose File > pick the document, archive, video, and so on. Telegram supports almost any format, and files keep their original quality with no compression.
On size limits, Telegram single-file caps are quite high (free users can already send very large single files, and Premium raises the cap further), which is plenty for everyday documents, videos, and installers. Note: if the file is sent but the recipient download keeps spinning, that is most likely a download-side or network issue rather than a failed send, so have them switch to a more stable network and clear the cache before retrying. The exact cap changes with official policy, so go by the actual prompt in your app.
How do you set a Telegram two-step verification password? If I forget it, am I locked out forever?
To set it: go to Settings > Privacy and Security > Two-Step Verification, set a login password, and strongly consider linking a recovery email at the same time.
Once on, every login on a new device requires both an SMS code and this self-set password. Forgetting the password does not lock you out for good, but recovery depends on whether you linked an email: tap Forgot password, and if you linked a recovery email the system sends a reset link so you can reset or turn off two-step verification immediately; if you did not link an email, the button becomes a Reset that takes about 7 days to go through via an in-app Telegram message, during which you cannot log in. So always link a recovery email to skip the 7-day wait.
How do you check which devices are currently logged into my Telegram?
In Telegram, open Settings > Devices (some versions call it Privacy and Security > Active Sessions),
and you will see the full list of devices currently logged into your account, including device model, the app used, region, and last activity time. The current device is listed separately at the top. Check this list periodically and sign out any device you do not recognize promptly. This is an important step for account security, and it is even safer combined with two-step verification turned on.
What is the difference between a Telegram group and a channel? Which should I build?
The difference between a Telegram group and a channel is who can post and what they are for. A Group is multi-person interactive chat where all members can post by default, suited to community discussion, Q and A, and exchange;
a Channel is one-way broadcast where only admins post and subscribers only read (you can open a comments section for interaction), suited to publishing notices, information, and works. How to choose: if you want everyone to chime in and discuss, build a group; if you want to broadcast one-way while your audience quietly receives, build a channel. Many operators use both: post content in a channel, with a paired group for discussion.
What if a Telegram file is over 2GB? Does Premium let you send larger?
A free Telegram account caps single-file uploads at 2GB; with Premium the single-file cap rises to 4GB.
So for a file over 2GB, the most direct fix is to get Premium and send the 4GB version. If the file is bigger than 4GB, you need to compress it or split it into multiple volumes and send them separately. Compared with WeChat and others, Telegram is already quite friendly to large files, and downloads are not throttled. The exact cap is subject to the Premium description inside the Telegram app.
How do you mute and block harassing strangers on Telegram? Do they know they are blocked?
On Telegram, on the other person chat page, tap their avatar at the top right to open the profile and choose Block User to block them; you can also manage your blocklist centrally under Settings > Privacy and Security > Blocked Users.
After blocking, the other person can no longer message you or see your online status and last-seen time, but the system does not actively tell them they have been blocked; they simply get no response after sending and see no delivery. You can also limit Who can find me / message me to contacts in privacy settings to further cut down on stranger harassment.
What extra privacy and advanced features does Telegram Premium unlock?
Telegram Premium mainly unlocks advanced-experience perks,
commonly including: larger file uploads (the single-file cap rises substantially), faster downloads, removing ads in official public channels, joining more groups/channels, pinning more chats, setting up more accounts, exclusive stickers and animated profile photos, and converting voice messages to text. It is essentially an unlock-more upgrade rather than an encryption upgrade: core security like end-to-end encryption, Secret Chats, and two-step verification is already available to free users, so Premium does not make your private chats more encrypted, only smoother and roomier. The exact items are subject to the Premium page in the app.
Sources: Telegram official feature tour · Telegram Secret Chats explained · Telegram Premium official guide