Many people are complaining about contacts missing after updating Xperia X10 to Android 2.1, then restoring contacts using backup and restore app. It is because no phone book is selected to display. This blog shows you how to solve this simple problem.
1.Restore the contacts and necessary things backed up before upgrade. To know how to restore check the video from 3.22 min.
2.After restoring if you can see all contacts properly then you are doing fine. If you cannot see the contacts in your phonebook, click on the button to the left of search box on your phonebook (shown with red and yellow dot in the image below)
3.After clicking that you will be taken to another screen, there you need to
a. [check] Contacts with phone number
b. [uncheck] Online contacts
c. [check] All contacts (check this depending upon the from where you synced the contacts from).
In my case I used Google to sync my contacts.Since(If) you are copying from restore app then check Phone contact –> All contacts
Hope this helps you. Do ask questions if any =) Do leave a comment if any !
You may want to check Review of Android 2.1 for Xperia X10 also
And Onscreen Keyboard options for Android too !! (Link opens in New tab/window)