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 Treo line's rich tradition. The Centro is also the first Palm phone to be eligible for the big V's "unlimited" E-mail and Web for Smartphone plan, which runs you a thrifty $29.99. After the full, delicious menu of rebates and discounts have been applied, Verizon's version will run the same $99 on contract that the boys and girls on Sprint and AT&T pay, and we can look for it to be available through all retail channels starting tomorrow.

Update: Palm also has a brand new Facebook app launching with this phone (which will be available for the AT&T and Sprint models as well).