Yes, #WhatsApp is down.
(Your wifi / phone signal is not the problem.)
While we're talking about #WhatsApp, be sure to use something like Signal app or Threema instead, and delete WhatsApp.
https://signal.org/
https://threema.ch/en
Mastodon is the best way to keep up with what's happening.
Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.