Wi-Fi auto join and connection issues

Hello wadex,

Thank you for reaching out to Apple Support Communities. We are happy to help you!

It seems your iPhone is connecting to cellular data while there's Wi-Fi available.

When Wi-Fi Assist is enabled your iPhone will automatically connect to cellular data when you have a poor Wi-Fi connection. Check to see if this setting is enabled, as outlined in the article below:

About Wi-Fi Assist

"Turn Wi-Fi Assist on or off 

Wi-Fi Assist is on by default. If you don't want your iOS device to stay connected to the Internet when you have a poor Wi-Fi connection, you can disable Wi-Fi Assist. Go to Settings > Cellular or Settings > Mobile Data. Then scroll down and tap the slider for Wi-Fi Assist."

We hope this finds you well!

Cheers!

Hello wadex,

We have provided you with a few additional helpful steps on what we could recommend to adjust your router and Wi-Fi settings to: 

Recommended settings for Wi-Fi routers and access points

"Auto-Join when used with wireless carrier Wi-Fi networks

Wireless carrier Wi-Fi networks are public networks set up by your wireless carrier and their partners. Your iPhone or other Apple cellular device treats them as known networks and automatically connects to them.

If you see ”Privacy Warning” under the name of your carrier's network in Wi-Fi settings, your cellular identity could be exposed if your device were to join a malicious hotspot impersonating your carrier's Wi-Fi network. To avoid this possibility, you can prevent your iPhone or iPad from automatically rejoining your carrier’s Wi-Fi network:

1. Go to Settings > Wi-Fi.
2. Tap  next to the wireless carrier's network.
3. Turn off Auto-Join."

How iOS decides which wireless network to auto-join

We hope this finds you well!

Cheers!