有时候
1. 我们登陆好好的电报账号就自己退出了，再登陆就提示手机号码被封（This phone number is banned）；
2. 甚至有小伙伴用新的手机号注册Telegram/电报/纸飞机的时候直接提示号码被封了。
这可能是账号使用的IP不干净或者是用来注册账号的号码的前主人滥用账号被封了。简单申诉下就可以！
https://core.telegram.org/api/obtaining_api_id
Due to excessive abuse of the Telegram API, all accounts that sign up or log in using unofficial Telegram API clients are automatically put under observation to avoid violations of the Terms of Service.
If you didn't violate the Terms of Service but your account does get banned after using the API, write to recover@telegram.org explaining what you intend to do with the API, asking to unban your account.
Please note that emails are checked by a human, so automatically generated emails will be detected and banned.
申诉方法很古老很直接：发邮件给 recover@telegram.org，邮件里写清楚被封的手机号码（要用国际电话形式，即要加上号码的国家代码，中国的国家代码是“+86”，美国的是“+1”），并简单描述下号码情况，官方有专人负责审核，基本是只要写邮件就会处理。
解封后可能没有邮件回复，因此可以隔天尝试登陆/注册下。