Perfect results (SIP TCP vs UDP)

Yes, I knew that TCP is better for mobile VoIP, battery consumption is better, but I did not knew HOW BETTER!
Yesterday I have replaced UDP to TCP at my Android softphone (Bria) and... Usually by this time (2:20 PM), my cellphone battery has 50% charge and now it is 88 percent.

Voice quality... I do not feel any difference.