please help me in recovering my lost contacts on WhatsApp Please I formatted my phone by mistake and in the process my WhatsApp was uninstalled and some very important contacts deleted please how can I still get the contacts back on WhatsApp please help.
The contacts would be safe if you have saved them either in your SIM or have backed up them in your Google Account. The main thing is whether you have a chat backup or not. If not, then I don't think there's any way you can get the chat back on your phone. If it is there (assuming that you have not deleted that backup) then you will get a prompt to install it when you are again logging in with your number.
A same instance happened with me and luckily I had a backup in My Drive account.