Many spam phone calls are being received that are caller ID spoofed. This means that call blocking is less effective since the caller's number is ever-changing. It would be helpful if call blocking would reveal the true caller ID, but if this is not possible, more sophisticated features for call blocking would help. For example, US phone numbers have 10 numbers. Many calls I have received recently are caller ID spoofed using 9 or 11 numbers. Call blocking could be set to block all numbers except 10. Do not underestimate this problem. This is so bad the phone is almost unusable.