The Mural follows its 3G predecessors by offering a solid selection of music-related features, such as support for XM Radio, a Music ID app, and music videos. You also get an application for creating your own ringtones and saving music tracks as ringtones.
The 2-megapixel camera takes pictures in four resolutions, from 1,600x1,200 down to 320x240. Other editing options are fairly standard. You'll find three quality settings, a self-timer, a multishot mode, a brightness control, a 4x digital zoom, three color effects, and three white balance settings. The camcorder shoots clips in three resolutions and offers a similar set of editing options. Clips meant for multimedia messages are capped at 42 seconds, but you can shoot for longer in standard mode.
When finished shooting you can send pictures to a friend or store them on the phone's 70MB of integrated memory. That's not a lot of space, so you'll want to invest in a microSD card. We didn't get one in the box, but the Mural can accommodate cards up to 16GB. Photo quality is admirable, with natural colors and little image noise. The camera also performs well in low light even though there's no flash.
You also get a selection of Java apps, some of which are subscription-based. They include My-Cast Weather, WikiMobile, Yellowpages Mobile, a unit and currency converter, a world clock, MobiTV, and Mobile Banking. And thanks to the integrated Assisted-GPS, you can access AT&T Navigator and a Where app for local search.
You can personalize the phone with a selection of screensavers, animations, wallpaper, themes, and alert tones. More options, and additional ringtones, are available from AT&T's Media Mall service using the WAP browser. Gamers can test demos of Block Breaker, Diner Dash 2, JewelQuest2, and Tetris. You'll have to buy the full versions for extended play.
We tested the quad-band (GSM 850/900/1800/19000) Nokia Mural 6750 world phone in San Francisco using AT&T service. Call quality was decent on the whole, though it was not without its faults. Voices sounded natural, but the volume was low and we heard a slight background hum during most calls. The signal was occasionally inconsistent as well; there were a few times where the Mural failed to place a call.
Callers mentioned similar conditions. They didn't report any voice distortion, but they had trouble hearing us on occasion and some of our friends also heard the background hum. Automated calling systems could understand us most of the time; we had trouble only when we were trying to call while outside. Speakerphone calls were about the same. The external speaker gets fairly loud and there was minimal voice distortion at the highest volume levels.
Streaming video quality was above average. There was some pixelation, but it wasn't distracting. We liked that the frame size takes up the full display and that it defaults to a landscape orientation. The audio is sufficiently loud and was in sync with the video.
The Mural has a rated battery life of 4 hours talk time and 14 days standby time. It has a tested talk time of 3 hours and 30 minutes. According to FCC radiation tests, the Mural has a digital SAR of 1 watt per kilogram.