Two SIM slots; HSDPA, Wi-Fi, Bluetooth and GPS support; front-facing and rear cameras
Short on internal memory; can be unresponsive at times
Acer's Tempo DX900 is currently the only available option in the UK for those seeking a Windows Mobile device with support for dual SIMs. It certainly does a good job of handling both SIMs, but it's not the slickest smart phone available
7 Very good
Reviewed by Sandra Vogel
Acer launched four Windows Mobile devices a few months back, but hasn't trumpeted them much since. These devices follow Acer's purchase of mobile-device specialist E-TEN. It seems that Acer is waiting to broadcast its entry into the smart phone market until its Windows Mobile 6.5-based devices start to appear towards the end of this year.
Acer may be missing a trick by keeping quiet about the Tempo DX900 though. It brings something unique to the UK: a Windows Mobile device that supports two SIM cards. It's available SIM-free (ironically) for around £400.
Design
The DX900 is a squat little smart phone, measuring 61 by 106 by 17mm. It's comfortable to hold and not too large for the pocket. It weighs 147g, which makes it heavier than your average Windows Mobile device, but not overly so.
The design is unremarkable. The shell is made from black plastic with a rubbery finish everywhere bar the screen surround, which is shiny. Shiny silver-coloured buttons sit beneath the screen. There are call and end buttons and, between them, a large navigation pad. All of the buttons are bordered by a white light when pressed -- a useful touch in low light or at night.
There's an array of slots and connectors around the edges of the DX900. On the left is a 2.5mm headset jack. Above this is a button that, with a long press, activates voice recording, and, with a short press, starts the voice-command software. Above this is a pair of volume rockers. The right edge has the main on/off switch, a microSD card slot and a camera button.
The sharp, bright touchscreen measures 71mm (2.8 inches) across the diagonal and has a native VGA resolution of 480x640 pixels. Windows Mobile 6.1 is not particularly finger-friendly though, and you'll need to use the stylus for a good deal of activity. This lives in a housing on the back right bottom edge. The stylus is telescopic, extending to 90mm as you extract it from its slot, and extremely light.
The DX900 ships with a mains power charger, a USB PC cable, a stereo headset, a screen protector, a spare stylus, a protective pouch, a printed quick-start guide and two CDs. One of these contains the user manual, while the other contains Windows Mobile's PC synchronisation software.
Features
The DX900 runs Windows Mobile 6.1 Professional. It comes with 256MB of ROM and 128MB of RAM. These are not generous specifications by current standards, and a fair amount of the storage memory can be used up by preinstalled extras (more on that later).
The DX900 has a 533MHz Samsung SC3 6400 processor. Responsiveness is good, but not great. This is a 3G device with HSDPA support, and it includes Wi-Fi and Bluetooth. There's a GPS receiver built in, a front-facing camera for two-way video calling and a 3-megapixel main camera with LED flash and self-portrait mirror. The device supports TV out, but no cables are provided for this.
There is an accelerometer that you can enable if you are happy for the device to switch screen orientation as you turn it in your hand. This can be useful for things like Web browsing and photo viewing, which benefit from a wide-screen orientation. You can configure the DX900 with an exceptions list, telling it not to switch orientation when certain applications are running.
The most significant feature of the DX900 is its support for two SIMs, both of which are located beneath the battery.
A SIM manager utility lets you edit contacts stored on each SIM, and, when sending SMS messages, you can easily choose which SIM to send the message from: a simple screen is appended to the SMS creation tool, which pops up after you press 'send'. Incoming SMS messages to both SIMs are brought together in the SMS inbox.
The Windows Mobile Comm Manager has been tweaked to make it easy to switch between SIMs when making outgoing voice calls. The DX900 has a version of Spb Mobile Shell, which you can run on top of the Windows Mobile user interface. This provides you with signal-strength information for both SIMs at the same time. The soft keypad for call dialling has the call button mapped to one SIM card and the end button to the other, so you can easily choose which to use.
E-TEN's habit of augmenting Windows Mobile with a vast array of extras is evidenced again with the DX900. When you first switch the device on, or after a hard reboot, you're offered the option of which extras to install. Choose them all and you have 105MB of storage memory remaining.
The extras are: Namecard Manager, which is used in conjunction with the camera to recognise business cards and send their contents to the contact manager; a backup utility; Voice Commander for voice control; Location SMS for sending an SMS message with your location in latitude and longitude as part of a text message; Satellite Data for improving the efficiency of the GPS receiver; and Easy Keyboard, a somewhat larger and more finger-friendly touch Qwerty keyboard than the standard Windows Mobile one.
Performance
We found the DX900 rather slow to respond to key presses at times. That's not a disaster, but it makes the DX900 feel less than slick on occasion.
Battery life is reasonable but not outstanding. We asked the DX900 to play music from a fully charged battery for as long as possible. It lasted 5 hours and 38 minutes. If you are a heavy Wi-Fi, 3G or GPS user, you may find you need to locate a power source for charging during the course of a typical day.
Conclusion
If you want a Windows Mobile device with dual SIM support, Acer's Tempo DX900 is the only available option in the UK. It does its job of handling two SIMs well, with the included applications having been suitably tweaked.
Additional editing by Charles Kloet
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