Contacts and sms data store in the path below:
data\com.android.providers.contacts
data\com.android.providers.telephony
But before that you need to extract data.img (Nandroid image):
Use unyaffs.exe in a Windows environment with the format below:
unyaffs image_file_name
Then you will get your data.img file extracted. Find your data from the above path and restore them to the same path of your phone system, then reboot to get your data reloaded.
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