You weren't alive in the 80s were you? If you were, you would know that cell phones didn't have an OS anything like any phone today including the G1. Especially the G1. Infact, PCs didn't have OSs like the G1. Infact, there wasn't a microprocessor in existence in the 80s that could run the G1's OS. I'm not defending the G1's OS by any means, I just know for a fact it's better than ANYTHING you would find in the 80s. Amiga might put up a fight, but that's stretching it.
For all the TMO haters out there, I welcome you to switch to another carrier. Enjoy those astronomical prices of ATT, Verizon and the like. Enjoy!