My biggest complaint with both Sprint and Verizon phones has been their inability to work while in other countries where GSM is the network of choice.

Apparently Verizon has heard that complaint more than once and now have a phone to deal with it. Since we originally reported about this phone some additional details have been uncovered.

The somewhat clumsily named HTC PD42100 is a dual-mode, phone sporting a slide-out QWERTY keyboard, 802.11n, CMDA2000, GSM850, and EVDO REV-A. Some have even speculated that it will include a 1.2 GHz CPU. I can’t help but say, this phone looks shocking like a Nexus One with a keyboard.

After applying some geometry and unit conversion, we’re able to conclude that, as has hoped, the PD42100 features a huge, 4-inch display. Based on the timing of its passage though the FCC along with current offerings and known product release schedules, we assume that this device should hit shelves sometime in early 2011.

If this timing holds, rather than shipping with Froyo, the device could come with Gingerbread (the version of Android to follow Froyo).

Also, with Sprint’s 4g network in full-swing, and T-Mobile’s HSPA+ roll-out already in progress, I’d be surprised if this phone wouldn’t have some sort of “faster than 3G data” on-board.