If your phone isn't ringing for incoming calls, several settings and features could be to blame. First, check your ringer volume and ensure it's not muted or set to a low level. Also, verify that Do Not Disturb or Airplane mode is not enabled. Additionally, confirm that call forwarding is disabled, as it redirects calls to another number, and that the number calling you is not on your blocked list. If none of these are the issue, try restarting your phone or checking for software updates.