Im thinking the same as u. U cant imagine my disapointment when i couldnt play the game! Ill wait till tuesday if they resolve the issue. Payed 1000€ and more just for nothing!
I have zero issues with playing Pokémon Go on my phone. I just have HORRENDOUS battery life. Everything else is great.
I used Google login if that makes a difference. I don't have a Niantic account or didn't use Facebook login.
I have exynos 990 chip if u have snapdragon good for u - i saw on niantic site that with upcoming update they will resolve the issue. But it is realy frustrating having the best phone ever and not be able to play the game...