The smartphone can handle multiple e-mail and social networking accounts, including Gmail, Yahoo, Exchange, Facebook, and Twitter. We had no problems adding our Gmail, Exchange, Facebook and Twitter accounts to our review unit, and we received messages and updates without problem. The Comet offers a unified inbox and calendar, though you can choose to keep your accounts separate if you prefer.
Multimedia capabilities on the T-Mobile Comet are pretty standard. The built-in music and video player supports a range of music and video codecs, including MP3, AAC, AAC+, eAAC+, MPEG4, WAV, and MIDI. The music player's interface leaves much to be desired, but it supports on-the-fly playlist creation, shuffle/repeat modes, and a "Use as ringtone" feature. The handset also has an FM radio and a dedicated YouTube player. The Comet only has about 149MB of internal memory, but as we mentioned earlier, T-Mobile includes a 2GB microSD card and the expansion slot can accept up to 32GB cards.
The Comet has a 3.2-megapixel camera. Editing options are pretty limited, but you get white-balance settings, digital zoom, geotagging, and video capture. Picture quality was pretty much what we expected: grainy with dull colors. Still, you can make out the objects in the photos, and shots taken outdoors fared better. Video quality was pretty murky.
We tested the quad-band (GSM 850/900/1800/1900; UMTS/HSDPA) T-Mobile Comet in New York and call quality was quite good. On our end, the audio was clear with little to no background noise, and voices sounded rich and full. Friends also reported good results and didn't have any major complaints.
T-Mobile Comet call quality sample
Speakerphone quality was also impressive. Calls sounded rich and full without any of the tinniness and hollowness that often plagues speakerphone calls. In addition, there was enough volume to have conversations in noisier environments. We had no problems pairing the smartphone with the Logitech Mobile Traveller Bluetooth headset or the Motorola S9 Bluetooth Active Headphones.
We got pretty reliable 3G coverage in Manhattan, though there were spots, such as Midtown, where it wavered from 3G and EDGE. Over 3G, CNET's full site came up in a minute, while the mobile sites for CNN and ESPN loaded in 7 seconds and 12 seconds, respectively. YouTube videos loaded within several seconds and played back without interruption and with synchronized audio and sound. There is the option to switch to high quality, but with such a low-resolution screen, it doesn't make much of a difference.
The Comet is powered by a 528MHz processor, and though we never experienced any major problems or delays, the smartphone can be sluggish at times. It always registered our commands, but the handset could hang for a couple of seconds before launching the appropriate app or task.
The T-Mobile Comet ships with a 1,200mAh lithium ion battery with a rated talk time of 9 hours and up to 12 days of standby time. The Comet fell well short of the promised talk time in our battery drain tests, offering just 5 hours of continuous talk time. According to FCC radiation tests, the Comet has a digital SAR rating of 1.27 W/kg.