Like it or not, T-Mobile has now officially turned its myTouch brand into an entire franchise, thanks to the addition of a second model and an entire line of styled accessories — but it’s not just about the hardware. Far from it, in fact: with the myTouch 3G Slide, the carrier has actually built a custom skin on top of HTC’s Sense for Android 2.1, and all kidding aside, this phone represents one of the deepest carrier-customized experiences we’ve ever seen. Seeing how this phone arguably represents the true successor to the G1 — T-Mobile’s (and the world’s) first retail Android device — it’s pretty important that they get this right, particularly considering how critical it is for a carrier’s bottom line to capitalize on the meaty, profitable midrange of its smartphone lineup. Does the myTouch 3G Slide live up to the G1′s good name? Read on.