Wi-Fi works incredibly slow on iphone, but fine on other devices. What will

My phone works incredibly slow when it is connected to my Wi-Fi. I can't load youtube videos, Facebook or any other social media apps/websites. They sometimes load, but take forever that I just use LTE data. A Wi-Fi extender did not resolve this issue. My laptop and TV connect to the internet fine and all of my roommates don't seem to have this issue. Are there too many devices connected to the Wi-Fi (my two roommates have their phones, computers, TVs, and printers connected)? Is it just a problem with my phone? I checked the IP address and everything. I pay the Wi-Fi bill and it sucks that I can't even use it. Any tech-savvy people know what will help?

IPhones are for losers

What model iphone? How much free space?

See if you can change the MTU from the default which should be 1500 to something smaller, like 1400. I've had IOS that would not connect with the default MTU but work with a lower one.

Stand no more than 20 feet from your Wi-Fi router and do some testing to see if things get better if you have a strong Wi-Fi connection. Also, I'd change the Wi-Fi passcode for 20 minutes just to make sure I was using the only Wi-Fi device during my test. I'd change the passcode back when I was done.

If you schedule your test with your roomies you should get fewer complaints!

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