The Xoom, the first device to run Google’s Android Honeycomb OS for tablets, works on Verizon’s 3G network and became available on Thursday.

When Motorola announced the tablet last month, it said users would be able to upgrade it for use on Verizon's 4G LTE network. At the time, Motorola didn’t say how it would manage such an upgrade.

Users can sign up to receive an e-mail notification from Verizon when the upgrade is available. Verizon said it would be “shortly,” while Motorola said the upgrade would happen in the .

To get 4G, users are to first back up all the data on the Xoom and then send it in to Motorola. They should , Verizon said. That means the process could take a week or more, since six business days would encompass a weekend.

There is no additional cost for the upgrade. The Xoom costs US$600 with a two-year Verizon data contract, or $800 without.