Sorry for reviving this old thread, but my question fits here well.
I exported my contacts and messages with the app: com.github.tmo1.sms_ie-v1.5.4.apk
I was able to import the contacs, but not the sms, as GOS denies this app to access sms. FIXED: it can access sms, but it still is not possible to set as the default app for sms. The app needs to be set as the default sms app.
What is the solution?
Regards,
Oliver