The update is clocking in at more than 300 MB, so it’s recommended that you upgrade over Wi-Fi only, unless you’ve got a high or non-existent mobile data cap. Many people are reporting in the Android Central forums that their updates are failing to complete install on first try, too.
To check if you’ve got the update, go to Settings, About Phone, and then System Update.
The update comes follows on the heels of the Droid Razr HD and Razr Maxx HD getting their update to Jelly Bean at the beginning of December, and keeps Motorola’s promise to update their phones more frequently.
There’s no word yet on whether the original Razr or Razr Maxx will see Android 4.2.