Finally Apple gets some serious competition with T-Mobile's G1. Here is how the two stack up against each other.

Since the iPhone was launched 15 months ago it has defined, for many, what a smartphone experience should be. But today T-Mobile gives the iPhone a run for its money with the launch of the G1 smartphone. From the details that have emerged today regarding the G1, Apple now has a reason to be looking over its' shoulder. Here is a look at how G1 and the iPhone compare to one another.