Hello!
I'm from Latin America, logged in at friday and just kept my PS4 in rest mode (and thus not logging out), so I played normally, but my sister tried to login in her PS4 at saturday and couldn't (still can't).
I remember the last time it happened (I think it lasted about 1 week).
I think is still a mistery if Telefonica is the problem or if FFXIV servers are somehow blocking us.
Last time I "worked around the problem" by routing my cellphone with another provider internet (Claro/America Movil), logged in, and after the start screen loaded I would reconnect to my Wifi (Telefonica). It does cost money to do this, but if you're desperate, it may work!
This is probably affecting all Latin America users that connect via Telefonica. Last time I couldn't use the site or the forum. This time is seems "better", cause at least these sites are still kinda opening. Hope they can find the problem soon!