In rare cases, a permanent block is placed on a line by the provider. You can call your carrier’s support line to ask them to "reset all incoming call filters." 💡 Pro-Tip
If you aren't receiving calls from anyone, check your "Silence Unknown Callers" setting. If this is on, any number not in your contacts goes straight to voicemail. You can toggle this off in Settings > Phone > Silence Unknown Callers. Unblocking Calls on Android unblocking incoming calls