Who
My phone it’s given me difficulties I cant log in on wifi.and it doesn’t want to receive most things
iPhone 6s, iOS 14
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H izizile288,
Welcome to the Apple Community.
You might want to browse these articles (links below) from Apple support, for answers.
Connect iPhone to the internet
https://support.apple.com/en-au/guide/iphone/iphd1cf4268/ios
If your iPhone won’t connect to a Wi-Fi network
https://support.apple.com/en-us/HT204051
If you see "No Service" or "Searching" on your iPhone:
https://support.apple.com/en-us/HT201415
Resolve Wi-Fi and Bluetooth issues caused by wireless interference:
https://support.apple.com/en-us/HT201542
If your phone isn’t working right, try re-starting it:
https://support.apple.com/en-au/guide/iphone/iph841379c3d/ios
iPhone Support:
https://support.apple.com/iphone
Hope there's something here that helps answer / solve the situation :-)