I'm the one whos messed with all of these so I'll throw in my findings. I'm pretty certain these will do it but themeing can be quite forgetful and is full of trial and error.
4g lte icons are in systemui/res/drawable-xhdpi "stat_sys_data_connected_3g" "stat_sys_data_connected_4g_att" "stat_sys_data_connected_lte_att" "stat_sys_data_out_att_1" - 3
As for the conference call image and other callerid images for s5 phone they are in incallui.apk/res/drawable-sw360dp-xhdpi. "picture_conference" "picture_unknown"
Pretty certain it was those that finally changed it from the creep faces for me when I just themed it. As for the stock SecPhone.apk look in drawable-sw360dp-xhdpi "call_img_conference" "call_img_unknown" as well as both with covered after them probably.
I know this isn't the answer that you're looking for, but RockRatt posted several flashable zips of different 4g lte icons in an earlier version thread of s3rx, or hell maybe even the detmobilized thread. I'm not even sure if they will still work, but might be something you're interested in? Sorry, I don't have a link, might have to search for a bit...
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