How do you delete thousands of text messages at once? I have a HTC vivid and need to delete about 30,000 texts. Every time I try to do it, it freezes my phone. The same thing happens when I try to create a backup.
There is a way to delete all SMS and MMS (and call logs) all at once.

In Android, SMS are normally received and stored by the package com.android.providers.telephony. That package’s common name is “Phone/Messaging Storage” in Android 4.2.2 and “Dialer Storage” in Android 2.3.7.

If you clear all data of that app, all it’s databases are cleared and SMS/MMS are gone. You can “force stop” and then “clear data” with the app manager, which you find under 


Settings→Apps
Settings→Application settings→Manage applications


If you have an alternative SMS app, note that most of them side access the “standard” database anyway. – This is technically not clean, but has the huge advantage that you can swap SMS apps at will, because the SMS storage stays the same.