iPhone Connected to WiFi But no Internet - How to Fix that
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iPhone Xs – iPhone XS Max Won’t Stay Connected to WiFi
Some of the wifi networks I use are not very reliable, so I disconnect whenever they're not working well, but I don't want to fully remove them either. I used to disable my wifi completely, but I'd often forget and then and be using my data when just at work or at home.
One of the most frustrating issues Android users can have is to get a brand new phone and experience Wi-Fi connection problems. After doing a bit of research, it looks like this is actually a pretty common issue and a lot of users are dealing with it.
If iPhone Disconnects from WiFi whenever it is locked or goes in sleep mode, you will have a hard time making calls over WiFi network. While some users have reported this problem after an iOS update, it can also occur at any time due to network related issues.