Call quality via the T-Mobile LTE network was crisp and the HD calling was rock solid. We experienced no call drops and parties on the other end said we sounded super clear both via speaker and via the handset. Signal strength stayed strong in areas where my signal is usually weak.
The removable 3,000mAh battery is capable of providing up to 21 hours of talk time and can last up to 6 days via standby. Battery life is very important to me and my constant emails piled with app use and games usually wreak havoc on most of my devices, but the battery held up for most of the day albeit with minimal usage. Battery life did take a hit when camera usage increased over the course of this review but as always your mileage may vary. The removable battery definitely pays off if you are taking a lot of photo and video as you can swap out and keep shooting which is becoming less and less normal as more smartphone manufacturers opt for non removable batteries.