This app can backup phone call and SMS/MMS logs for a number of your choice. It can restore phone call logs.

To backup logs for a phone number type a phone number into the textbox, then click the get logs button to get all calls, and messages listed on the screen. The HTML file shown on the screen is saved to downloads as the phone number .zip. This zip file is a backup of your call sms/mms history in a human readable format.

For programmers: If you call the app activity with the extra parameter "phonenumber" with a value of the phone number it will save the logs for that phone number to downloads. The permissions need to be accepted first.

Google insisted this app must have a restore feature to comply with their policies. Therefore, the + button can be used to restore call logs from a previously created backup file. If this feature is used, existing logs will be duplicated. I strongly discourage you from using this feature.