Filed under: Cellphones, Handhelds Come on, T-Mobile, all we need is you to get on board now and that'll make a perfect Yahtzee! for Palm with its surprise hit, the Centro. Thanks to Verizon's expected announcement today, the top three US carriers now carry the diminutive Garnet device, which Palm actually says is "off to the strongest start of any smartphone in Palm's history" -- quite a statement, considering the