http://speechpro-usa.com/product/biometric/voicegridid
"Intercepting thousands of phone calls is easy for government agencies. But quickly analyzing the calls and identifying the callers can prove a difficult task.Now one company believes it has solved the problem—with a countrywide biometric database designed to store millions of people’s “voice-prints.”"
Probably to be expected considering face matching tech is so common it's part of many photo apps & on-line services. Also probably of limited use somewhere like the UK where people prefer to text vs. having a phone conversation. I guess now there's more of a reason to prefer texting.