Acer Tempo DX900 Acer claims its Tempo DX900 is the world's first smartphone to support both 3.5G and EDGE SIM cards simultaneously. Unfortunately dual 3.5G SIM cards are a no-go. Otherwise, the Tempo DX900 is similar to the Acer Tempo X960 in shape and features, with a 2.8in VGA touch screen, GPS, Wi-Fi and a 3Mp camera. The DX900 also features a slightly different user interface to the other three Tempo smartphones. It has 3D animated icons and transition effects, in a similar vein to HTC's TouchFLO 3D interface.