how do i manage the available memory on my phone?

Customers need 35 MB free memory.  Customers can uninstall apps, delete pictures, or move apps and pictures to the SD card.  We highly recommend syncing contacts with Gmail™ before upgrading your device, as well as backing up pictures and other data to your microSD card. If your contacts are not appearing after the upgrade, go to Contacts > Menu > Display Options > ___@gmail.com > Select: All other contacts. See Android Upgrade section.