The K1's phone book holds 1,000 contacts, with room in each entry for five phone numbers, three e-mail addresses, a Web address, three street addresses, and a birthday (the SIM card holds an additional 250 names). You can organize contacts into groups or pair them with a photo or one of 30 (24-chord) polyphonic ringtones for caller ID. Other basic offerings include a vibrate mode, a voice recorder, text and multimedia messaging, an alarm clock, a calendar, a calculator, and instant messaging. On the higher end, there's a speakerphone, voice dialing and commands, USB connectivity, e-mail, full Bluetooth, and PC syncing. The T-Mobile Krzr comes with only 12MB of internal memory but the Micro SD card slot gives you more room. A 128MB card should come in the box.
The K1 has a 2-megapixel camera, which is an improvement over the 1.3-megapixel shooter on the CDMA K1m. You can take pictures in just four sizes (2-megapixel, 1.3-megapixel, 640x80, and 320x240) and you get a selection of three quality settings. The camcorder shoots clips in two resolutions (176x144 and 128x96) with sound; editing options are similar to the still camera. Photo quality was decent but not quite what we expected from a megapixel camera. Images were bit blurry, and colors weren't always sharp.
Unlike the Sprint and Verizon phones, T-Mobile's Krzr K1 doesn't support 3G networks, but that's hardly an issue since T-Mobile doesn't offer a 3G network anyway. As previously mentioned, the K1 offers a generic Motorola music player. It's not exactly optimized for music--the interface is minimalist and the features are limited--but it plays MP3, AAC, and AAC+ just the same. You must load music on the phone via Bluetooth or a USB cable or use the MicroSD card.
You can personalize the T-Mobile Krzr K1 with a variety of wallpapers, screensavers, menu styles, and color skins. If you want more options or more ringtones you can always download them via the WAP 2.0 wireless Web browser. Gamers get two Java (J2ME) titles: World Poker and Gameloft Hits.
We tested the (GSM 850/900/1800/1900; GPRS; EV-DO) Motorola Krzr K1 world phone in San Francisco using T-Mobile's service. Sound quality was comparable with Cingular's Krzr K1 but there was a slight increase in static at times. On their end, callers said we sounded fine but they had they had about the same amount of trouble hearing us as they did on the Cingular phone. Speakerphone calls sounded a bit hollow but had enough volume, and Bluetooth headset calls were satisfactory.
The Motorola Krzr K1 for T-Mobile has a promised battery life of 3 hours talk time and 8 days standby time. Curiously, both rated times are lower than the Cingular Krzr K1. Our tests revealed a talk time of 3 hours, 30 minutes. According to FCC radiation tests, the Krzr K1 has a digital SAR rating of 1.07 watts per kilogram.