The HTC One (M8) is back in the 30 day challenge rounds and this time around we take a look at a feature that all mobile phones do well but is most overlooked in this new age of technology. Call quality. While people tweet, text, email, or use other means of communication, calling is still a very important way of communication via our mobile phones and since we've had the One in the challenge for a full three weeks so far it is a great time to test how good call quality and the experience of making phone calls is on the HTC One (M8)!