MobileTechReview has published a review of the E-TEN Windows Mobile 5 Pocket PC Phone with built-in GPS.

Specs: The G500 is designed to be the perfect all-in-one handheld device. At only 119 x 62 x 23mm the G500 is comparable in size to traditional mobile phone handsets. In addition to GSM phone and GPS functions, the device also serves as a high-specification PDA running Windows Mobile 5.0. The device uses a Samsung S3C2440 processor operating at 400 MHz and includes 128MB of Flash ROM and 64MB SDRAM memory, which can be used to save applications and files. The device uses a replicable 1,440mAh Li-Ion battery, which offers on average 3.5-4 hours of talk-time or 10-15 hours of Pocket PC usage. Finally, the G500 also features a 1.3M pixel CMOS camera and built in microphone allowing users to capture digital images, voice recordings, and even movies.

Good news: the G500's SiRF Star III GPS is excellent. The bad news is that you'll need to buy GPS software, just as with the US version of the HP iPAQ 6515. Out of the box, there's nothing you can do with the GPS, so get that software pronto or use software from your old PPC GPS.

The G500 uses the latest SiRF III GPS chipset which offers significant improvements over last generation chipsets. The major features that this chipset provides are high sensitivity, lower power consumption and fast time to fix. In fact, the SiRF III chipset has been re-architected to have the equivalent to more than 200K correlators as opposed to the old sequential search process that contains only a few hundred to a few thousand correlators. The result is your GPS receiver becomes much more sensitive and can get a good signal even under dense foliage, downtown high-rise buildings and indoors in many cases which was not achievable with past generations of GPS receivers. With SiRF III your GPS has a faster time to fix, especially time to first fix (TTFF) speed. The GPS also has SBA support that includes both WAAS stations in the US and EGNOS stations in Europe.