Seeing how the T-Mobile G1 will launch initially through T-Mobile and seeing how it has such a similar form factor, there have been many comparisons drawn between it and the Sidekick line of mobile phones.
In addition to HTC, which manufactures the T-Mobile G1 mentioned above, the three other handset manufacturers who are members of the OHA are LG Electronics, Motorola, and Samsung Electronics.
It was one of the largest manufacturer of Windows Mobile devices and it is the company behind the first ever Google Android phone, the HTC Dream G1 (which was also sold as the T-Mobile G1).
In terms of wireless connectivity, the T-Mobile G1 gets loaded with quad-bad GSM, high-speed 3G (up to 7.2Mbps), 802.11b/g Wi-Fi, Bluetooth 2.0, and a built-in GPS receiver.
Designed by the same HTC that created the first T-Mobile G1, the HTC Hero features an extra large, 3.2-inch touchscreen display that serves as your primary method of input.
Since HTC and T-Mobile released the original T-Mobile G1, several other Google phones have been released, including some notable offerings from Sprint in the United States.
If the Apple iPhone Developer Program sounds too expensive for your taste, you may want to consider the emerging popularity of Android phones like the T-Mobile G1.
The T-Mobile G1 is actually the HTC Dream G1, but it has been branded specifically to work with the T-Mobile network and its portfolio of services.
It should also be noted that the included camera is not capable of recording video nor is the T-Mobile G1 able to play video right out of the box.
BlackBerry users have plenty of models to consider and people who would prefer to try Google Android can get the T-Mobile MyTouch or T-Mobile G1.