I have a 15 pro that’s natural titanium and the MacBook has a lighter white as what I’ve seen
My 15 pros had this this both would show it’s connected to my home WiFi but not show the symbol I’ve done everything and it only works sometimes but it stops I’m going to go apple soon with both phones if it continues it’s a massive inconvenience
Sometimes when I have setup Apple devices the FMI feature is turned off and I have to manually turn it on
Get the phone blacklisted and report it stolen AT&T should be able to do it if Apple or best buy give the imei or serial number
Put it into lost mode
Go to a 3rd party store that is experts in microsoldering and let them fix it