THIS DOES NOT WORK ON ANDROID KITKAT 4.4 AND ABOVE. Only the default SMS app can delete message. Google have already copied most of the functionality I worked hard to put into this app anyway. Look in the sms app settings.
Speeds up unresponsive messaging applications. Can delete messages over a certain age, keep a set number of recent or trim threads to a set size. Auto cleanup deletes a SINGLE sms matching criteria when a NEW sms arrives. (Auto cleanup is not compatible with all devices unfortunately)
Click wrench to configure.
Notes: Does not delete messages stored in the "deleted" folder on some devices. Locked SMS messages are deleted. MMS messages are not deleted (only SMS).