I was an active iPhone users for more than 5 years now and now I purchased Samsung Galaxy S8 instead of iPhone 7 Plus (this is the worst decision of my life) because now I don't even know from where to download basic applications like WhatsApp and Skype, I am simply not even able to WhatsApp login in my previous iPhone, I think I made some error while installing and setting up WhatsApp App in my S8.

Well, the main issue is I do not receive OTP and without I can't do WhatsApp Login in my new smartphone, please help me with this.