Here is the process that I did to get the my Verizon app and data usage widget to work on my xoom. First setup you go online to to register your new number just like you would do with a cell phone. But when the system says it will text you temporary password you wont get it. Don't worry just call Verizon wireless and ask them if they can mail you your temporary (current) password via snail mail. They don't have any other way to get you your password. It will take about 5 business days but after you get the letter go back and finish your registration Process, input your current account info into your xoom and your done. It works great for me.
Hope this may help.
Hope this may help.