I’v suppressed an old account of Telefram and don’t understand which application I must use again.
Telegram FOSS said he have send a code on another device that I used recently, and also that this app -due to API- cannot be the app for the first time I sign.
How can I start again, and erase all my previous installation ?
Some month ago I made test and have also used a second SIM card. I wonder a stuff
Telegram FOSS can be used only if you have at account already.
You can’t make a new account, it’s a Telegram limitation for 3rd party clients.
Login to official TG via browser and then on FOSS and it will send the OTP on the browser client.
You can’t. This happened to me in the past. If you’re already login in some different device but can’t access any such device (or uninstalled the TG client) then it’s impossible to get codes even if try login TG on browser. Because TG always sends codes to login devices via TG, the SMS option doesn’t work.
But install Telegram X which is the only Android client based on TDLib. It can send you actual SMS code to your phone number 
thanks
I’v taken contact with the helpdesk because now Telegram refused on my 2 smartphone. I thing the only possibility is to suppress my account, but I can’t myself
You are right : I just desinstall Telegram and download Telegram X and now I received a 5 digit code on my phone. That’s great