iphone does not connect to wifi

my iPhone doesn't connect to wifi. my phone model is iPhone 12 pro. the phone itself is connected to WiFi in the settings, but I don't have a WiFi icon in the notifications section - it's not connected. my phone is only connected to a cellular connection. it's not about my router, my phone doesn't connect to any WiFi points. I do not know what to do. I used to have a 7 iPhone and I ran into the same problem on it, I didn't find a solution to it and bought a new phone. and a year after buying the iPhone 12 pro, I am again faced with such a problem. maybe someone had the same thing? please help me!

addition: I tried restarting the phone - it didn't help. I tried to remove the wifi from the settings and connect to it again