How can i backup my mobile numbers

Restore a backup to my phone

When you connect your phone to a computer for the first time, the Zune software will automatically create a primary sync relationship between your phone and that computer. Other computers you connect to after that will have a guest sync relationship with your phone. Your primary computer remembers your linked phone and all of its settings and history, which is why it's the only computer that will create a backup of your phone during the update process. If you need to change this relationship between your phone and your primary computer, see How to sync your Zune player or Windows Phone 7 . To create or restore a backup on Windows Phone 7, you need the Zune software. which is only available for PCs.

What gets restored

All of these items are restored automatically (assuming they were included in your last software backup):

Email and social network account settings. After restoration, your phone will sync the email messages, contacts, and calendar appointments associated with your accounts. Other system settings, including your preferences for theme, lock screen, wallpaper, and data connections. Apps. Any apps you purchased will still be available to you. However, in some cases, you might need to download some of them again (you won't be charged). You can find a list of the apps you've purchased in the My Phone section of windowsphone. For more information, see Delete or reinstall apps . Pictures Music Videos Documents

If you've previously uploaded files to OneDrive (formerly SkyDrive), those items will continue to be available to you.

What doesn't get restored

When you restore your phone, you might lose any items that are new or have changed since your phone was last backed up (that is, when you last installed a phone update). This means you might lose text messages, ringtones, music you've downloaded, and settings you've changed since your last backup.

If you're using Outlook without Exchange, your recently-added contacts might not be restored. For more information, see Import contacts from my PC.

For apps you've installed—whether you bought them from your phone or from your PC—the data and settings you added or changed won't be restored. Trial versions of apps can't be restored, but you can reinstall them from Marketplace on your phone.

During the restoration

You won't be able to make or receive calls from your phone. Don't use or disconnect your phone from your computer until the restoration is complete. You'll be notified when it is safe to disconnect your phone.

Restore a backup using your computer

Before you start, you'll need to:

Make note of any changes you made since your last update so you'll know what to do later to set up your phone the way you want.