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There is an invariable lag no matter what you do on the DX900 and it feels quite annoying alongside of the latest HTC phones. Now, that´s really odd, since the phone features nice hardware specs – 533 MHz. CPU, 128 Mb. RAM and 256 Mb. ROM.

Fortunately, making calls feels comfy due to the excellent voice quality and clarity. The only issue we encountered was voices had a slightly metallic tone to them. On the other hand, people we talked to claimed the sound was so powerful they had to decrease the volume to catch onto what we were saying. Having done that, they all invariably rated the quality excellent.

Although the battery can hardly win out in any endurance contest, that´s a common problem with all Windows Mobile smart phones on the market. The manufacturer claims a fully charged battery should give you about 5 hours of talk time or 150 hours in standby mode.


Do you really need a dual-SIM card phone and what are you willing to pay to get one? It´s not all about money here. Carrying the Acer DX900 around in your pocket will certainly fail to make you happy, but that´s an innate feature that most Windows mobile phones have to their credit. As a whole, the phone is sluggish, while the dual-SIM card function has been poorly implemented and feels like a nagging pain. What saves the phone from being characterized as a complete flop is the incredible sound quality during talks and its uniqueness. After all, this is the first and as of now the only dual-SIM Windows Mobile device out there, so you´re out of options should you really need one.

The software version of the reviewed unit is A147 WWE 0400466


  • Allows use of two SIM cards at the same time
  • Top notch quality of sound during talks


  • Bulky and unattractive
  • Sluggish interface
  • Weak multimedia capabilities
  • Dialing numbers through the second SIM cannot be done via the Contacts menu

PhoneArena Rating:


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