How to Fix the "This Phone Number Has Been Banned" Issue on Telegram and Prevent Future Bans

If you're trying to log in to Telegram and you get a message saying "This phone number has been banned", it means Telegram has officially blocked your mobile number. This'll stop you from logging in or even logging out of your account. Here's how you might be able to sort it out:

How to Fix It

Send an Appeal Email: Hit "Help" and send an email to lodge an appeal. You might want to send a few over time, but don't go overboard with it.
Wait for a Response: If multiple appeals don't unblock your account, you'll need to be patient and wait a few days. Sometimes, you just won't get a result.
Contact Telegram Directly: You could also try reaching out to Telegram's official channels via Twitter or email.
Results May Vary: Every account's situation is unique. Some users have had success getting unbanned, while others haven't been as lucky.

How to Avoid Getting Banned

To help prevent your account from getting banned in the first place, follow these tips:

Don't Spam or Advertise: Never post advertising content on Telegram.
Be Careful with Private Messages: Try to avoid sending private messages to strangers; it'll reduce your risk of getting reported.
Avoid Being Reported: Getting reported for private messages or having an admin ban you can both lead to account issues.
Steer Clear of SMS Verification Service Numbers: Numbers from these 'receive SMS online' platforms are often used by multiple people and are likely already banned.
Be Wary of Virtual Numbers: Some virtual numbers might have been used by others before, which carries a risk of getting banned.
Pick a Reliable Proxy: Make sure any proxy service you use is trustworthy; dodgy proxies can lead to bans.
Don't Bulk Register: Registering heaps of accounts from the same IP address or network can flag you for a ban.
Be Mindful of Group Anti-Spam Settings: If your messages in a group are mistakenly flagged as ads, it could lead to a ban. If you know a group has "strong anti-spam" features switched on, it's probably best to just leave that group.

On top of all that, it's a good idea to regularly back up your Telegram data to prevent losing anything if your account gets banned. Getting your account banned is often out of your hands, so backing up is a smart move.