Hi Whosnick.
Welcome to the Apple Community.
Apple support have articles online (links below) that may help you troubleshoot.
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT202639
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
https://support.apple.com/en-us/HT204051
View or change cellular data settings on iPhone
https://support.apple.com/en-au/guide/iphone/iph3dd5f213/ios
Set up cellular service on iPhone
https://support.apple.com/en-au/guide/iphone/iph3f11fba92/ios
Make calls using Wi-Fi on iPhone
https://support.apple.com/en-au/guide/iphone/iph78f4697ca/ios
Hope this helps :-)