Slow WiFi speeds (direct ethernet connections are fine) + DNS servers
I have AT&T Gigapower and overall, I'm very pleased. The direct connection to my Mac consistently pulls 900/900. However, over the last week or so my WiFi speed tests on my iPhone has gone from consistent 300 Mb/s speeds down to 30-50, even after restarting my router/modem combo. I was curious about some quick things to check to fix this.
Also, I have a quick question on DNS servers. I've read a mixed bag of "You can use alternative DNS servers" and "You can NOT use an alternative DNS server" on Gigapower. Which is true?