[Sprint Samsung Galaxy S 4 General] 0x6A7232:
Ok, after further research, it appears the OD2 Hotspot mod is causing this.

FTR, while I was tinkering, I found that deleting an app's /data/data/{appname} directory for the most part causes Android to rebuild that directory with the app's default configuration files.

There appears to be some exceptions, or maybe errors in the default recovery process, as

/data/data/com.android.providers.telephony/databases/nwk_info.db

and

/data/data/com.android.providers.telephony/databases/nwk_info.db-journal

were not rebuilt, and I had no data until I restored that. BE SURE TO BACK UP THE DIRECTORY BEFORE DELETING, AND NOTE THE PERMISSIONS AS WELL AS THE OWNER AND GROUP.

You can use (after putting in su and enter to switch to root)

cp -p -r [SOURCE] [DESTINATION]

in Terminal Emulator for that - the -p switch copies permissions, the -r switch copies recursively aka subdirectories BUT! Please note that anything using an MS filesystem (exFAT, FAT32, NTFS) won't copy the permissions / owner / group.

What got me pointed towards trying the above was this thread (for KK 4.4.2 on a S G S2 I believe so some things need to be changed obviously) here: http://xdaforums.com/galaxy-s2/general/howto-eradicate-unfortunately-process-t2424803

Also, found some interesting stuff in this thread that maybe I'll mess with later:

http://xdaforums.com/showthread.php?t=2137826

http://xdaforums.com/showthread.php?t=2260142

Anyways, back on topic & TL;DR =

It looks to be the OD2 Hotspot is causing the phone problem, so I will research and post back what I find.

EDIT: oh, and your MMS & SMS text messages are in the /data/data/com.android.providers.telephony/databases/mmssms.db* files

---------- Post added at 08:19 AM ---------- Previous post was at 07:59 AM ----------

K, I think I found the problem:

delete_recursive("/system/app/LegacyInCallUI");

Oopsie, I don't think that is a good idea. ..

Here's the full text of the Hotspot mod updater script (META-INF/com/google/android/updater-script)

show_progress(1.34, 30); ui_print(" "); ui_print("#########################"); ui_print("# Lollipop-OD2 #"); ui_print("# Hotspot Mod #"); ui_print("# by bilgerryan #"); ui_print("#########################"); ui_print(" "); ui_print(" Mounting Filesystems... "); run_program("/sbin/busybox", "mount", "/system"); run_program("/sbin/busybox", "mount", "/preload"); run_program("/sbin/busybox", "mount", "/data"); run_program("/sbin/busybox", "mount", "/cache"); run_program("/sbin/busybox", "mount", "/sdcard"); ui_print(" "); ui_print(" Flashing files... "); delete_recursive("/system/app/LegacyInCallUI"); package_extract_dir("system", "/system"); package_extract_dir("preload", "/preload"); package_extract_dir("data", "/data"); set_perm_recursive(0, 0, 0755, 0644, "/system/app"); set_perm_recursive(0, 0, 0755, 0644, "/system/priv-app"); set_perm_recursive(0, 0, 0755, 0644, "/preload/symlink/system/app"); set_perm_recursive(0, 0, 0755, 0644, "/system/framework"); ui_print(" "); ui_print(" "); delete_recursive("/data/tmp"); package_extract_dir("vrtheme", "/data/tmp/vrtheme"); set_perm(0, 0, 0755, "/data/tmp/vrtheme/installtheme.sh"); set_perm(0, 0, 0755, "/data/tmp/vrtheme/zip"); set_perm(0, 0, 0755, "/data/tmp/vrtheme/zipalign"); run_program("/data/tmp/vrtheme/installtheme.sh"); run_program("/sbin/busybox", "umount", "/system"); run_program("/sbin/busybox", "umount", "/preload"); run_program("/sbin/busybox", "umount", "/data"); run_program("/sbin/busybox", "umount", "/cache"); run_program("/sbin/busybox", "umount", "/sdcard"); ui_print(" "); ui_print(" Installation complete "); ui_print(" ");

So I'm restoring LegacyInCallUI from the ROM .zip now.

---------- Post added at 08:33 AM ---------- Previous post was at 08:19 AM ----------

Restored LegacyInCallUI, set permissions, rebooted, phone works great now.

So we should just remove that offending line from updater-script, re-zip, and the Hotspot mod should be good to use as far as I know.

Perhaps someone should take a look at the whole thing, just in case, though?

---------- Post added at 08:46 AM ---------- Previous post was at 08:33 AM ----------

Alright, apparently the author is aware and has fixed, see his response in the release thread:

http://xdaforums.com/showpost.php?p=61014133&postcount=7

So be sure to get v 1.1 I guess. XD

This has been a fun adventure and a half! .;)