With Over the Air (OTA) updates, you don’t need any cables or computer, just download and install the update using your phone. Updates are free of charge, but to download the update, you need an internet connection. It is best to use a Wi-Fi connection to avoid mobile data transmission costs.
Software updates from Microsoft are safe to install, and your settings, apps, photos, and text messages remain safe and sound.
Step 1. Your phone notifies you in the Events view whenever updates are available for your phone software or for individual apps. You can check for updates also in Settings > Applications > Manage applications > Updates.
Step 2. To view and to install the updates, just tap the notification message, and follow the instructions shown on your phone. You can install the update immediately, or postpone the update for a more convenient time.
Step 3. The update should take around 15-30 minutes, and you are not able to use your phone during the update installation.