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On a rooted phone, I merely delete /data/data/com.android.providers.telephony/databases/mmssms.db and then reboot.
Is there anything similarly quick that can be done on an unrooted phone?
I have a phone that has upwards of 50k texts and every app is hanging when trying to delete a single conversation.
(Android 6.0.1)
Not near as quick, but SMS Backup & Restore app and other SMS management apps can do this, also many SMS messenger apps can do this as well, but without root you cannot do it manually.
You doesn't need root to done this, You can simply go to Settings, Apps and find message service then click Clear cache and storage.
I'm not sure is this a useful answer to this question.
My problem was, I need to delete all the conversation from my messages app on my phone. Since I'm a stock Android user from the past 5 years, all the messages from 5 years still exist in my new android phone (now I'm using pixe2). Why? , because google will sync all conversations with google account.
There is no option in default messages app to delete all conversation. I tried to clear app data, but not worked. Because Google will sync all the conversation back again to my phone. I tried to install other SMS apps but it not showing old conversations on my google account.
Finally, I found an app from Microsoft in the Google play store "SMS Organizer - Clean, Reminders, Offers & Backup"
https://play.google.com/store/apps/details?id=com.microsoft.android.smsorganizer
It will sync conversations from google account and it has the option to delete all conversations. It worked..
