Can't connect to internet once I sign into new iphone with icloud

I recently had to get a new phone (iphone16). I returned the first one because I could not connect to anything, ie. wifi, internet, bluetooth. I am having the same trouble with the replacement. I believe it has something to do with my settings after signing in with icloud. I have reset network settings and phone settings but it hasn't helped. I guess I could start over with a new account but if there is a way to avoid that I prefer to do so. Any thoughts on what the problem is and and how i fix it?