Do I need an Apple ID to use an iPhone?  Technically no.  But an Apple ID is just an email address and password protected account that allows you to access all the features of your phone, (Apple Pay, Music, messages, etc, etc.,) so if you don't have one, one would really question why you would want an iPhone to begin ...

If you see No Service or Searching in the status bar on your iPhone or iPad (Wi-Fi + Cellular), your device isn't connected to a cellular network.

To play this game on PS5, your system may need to be updated to the latest system software. Although this game is playable on PS5, some features available on PS4 may be absent.

Call of Duty: Modern Warfare 2 Remastered - PS4 & PS5 | Backwards Compatible.