Version 1.4.0 * Android 7 behavior of marking contacts DIRTY on every SMS/call (although no relevant contact data are changed¹) is workarounded by using hash codes. Now, contacts won't be uploaded after every call/SMS anymore. * Fixed display problem of sync intervals in DAVdroid account settings: previously, the Android calls were synchronous. Note that Android 7 will rewrite sync intervals of < 15 min to 15 min automatically. This is an Android "feature" and can't be changed by DAVdroid. * Upgrade to okhttp 3.6.0, which provides some HTTP/2 and other improvements. * More verbose logging.