FYI....I work in a profession that sometimes require me to go 15 to 20 FT underground, concrete walls and some metal barriers enclosed around and about me. I received and made calls while I was in this location. There was no dropped calls, no skipping in conversation and I was able to received a message (mail also). I thought this was great....I didn't have to say 'CAN YOU HEAR ME NOW?' to the person on the other end of the call. This phone's quality of receiving and sending calls and the quality is AWESOME! Just wanted to share with the 'DINC FAMILY'.