Adds hear_1, cells work.

code/__DEFINES/important_recursive_contents.dm

@@ -1,4 +0,0 @@
-///the area channel of the important_recursive_contents list, everything in here will be sent a signal when their last holding object changes areas
-#define RECURSIVE_CONTENTS_AREA_SENSITIVE "recursive_contents_area_sensitive"
-///the hearing channel of the important_recursive_contents list, everything in here will count as a hearing atom
-#define RECURSIVE_CONTENTS_HEARING_SENSITIVE "recursive_contents_hearing_sensitive"

code/game/atoms_movable.dm

@@ -770,14 +770,3 @@
 	animate(I, alpha = 175, pixel_x = to_x, pixel_y = to_y, time = 3, transform = M, easing = CUBIC_EASING)
 	sleep(1)
 	animate(I, alpha = 0, transform = matrix(), time = 1)
-
-///allows this movable to hear and adds itself to the important_recursive_contents list of itself and every movable loc its in
-/atom/movable/proc/become_hearing_sensitive(trait_source = TRAIT_GENERIC)
-	if(!HAS_TRAIT(src, TRAIT_HEARING_SENSITIVE))
-		RegisterSignal(src, SIGNAL_TRAIT(TRAIT_HEARING_SENSITIVE), .proc/on_hearing_sensitive_trait_loss)
-	ADD_TRAIT(src, TRAIT_HEARING_SENSITIVE, trait_source)
-
-/atom/movable/proc/on_hearing_sensitive_trait_loss()
-	SIGNAL_HANDLER
-	UnregisterSignal(src, SIGNAL_TRAIT(TRAIT_HEARING_SENSITIVE))
-	REMOVE_TRAIT(src, TRAIT_HEARING_SENSITIVE, src)

code/modules/antagonists/gang/cellphone.dm

@@ -12,7 +12,7 @@ GLOBAL_LIST_EMPTY(gangster_cell_phones)
 /obj/item/gangster_cellphone/Initialize()
 	. = ..()
 	GLOB.gangster_cell_phones += src
-	become_hearing_sensitive()
+	flags_1 |= HEAR_1
 
 /obj/item/gangster_cellphone/Destroy()
 	GLOB.gangster_cell_phones -= src