diff --git a/biz/admin.py b/biz/admin.py
index 1abad08..f35bd94 100644
--- a/biz/admin.py
+++ b/biz/admin.py
@@ -121,7 +121,7 @@ class ProspectAdmin(SyncedObjectAdmin):
                 'fields': ['related_activities', 'id', 'entity_names', 'first_name', 'last_name', 'email', 'phone', 'contact_again', 'official_user', 'name_unsure', 'entities', 'related_user']
             }),
         ]
-    list_display = ('first_name', 'last_name', 'entity_names', 'last_update_date', 'current_status', 'current_text', 'contact_again')
+    list_display = ('first_name', 'last_name', 'entity_names', 'phone', 'last_update_date', 'current_status', 'contact_again')
 
     list_filter = (ContactAgainFilter, ProspectStatusFilter, ProspectDeclineReasonFilter, ProspectGroupFilter, PhoneFilter, 'creation_date', StaffUserFilter, 'source', ProspectProfileFilter)
     search_fields = ('first_name', 'last_name', 'email', 'phone')
@@ -435,10 +435,10 @@ class ProspectGroupAdmin(SyncedObjectAdmin):
 
 @admin.register(Activity)
 class ActivityAdmin(SyncedObjectAdmin):
+    raw_id_fields = ['prospects']
     list_display = ('prospect_names', 'last_update', 'status', 'type', 'description', 'attachment_text', )
     list_filter = ('status', 'type')
-    search_fields = ('description',)
-    filter_horizontal = ('prospects',)
+    search_fields = ('attachment_text',)
     date_hierarchy = 'last_update'
 
     def get_form(self, request, obj=None, **kwargs):
diff --git a/biz/filters.py b/biz/filters.py
index 848d376..5714c53 100644
--- a/biz/filters.py
+++ b/biz/filters.py
@@ -147,6 +147,7 @@ class PhoneFilter(admin.SimpleListFilter):
     def lookups(self, request, model_admin):
         return (
             ('exclude_mobile', 'Exclude mobile (06/07)'),
+            ('mobile_only', 'Mobile only (06/07)'),
         )
 
     def queryset(self, request, queryset):
@@ -154,4 +155,9 @@ class PhoneFilter(admin.SimpleListFilter):
             return queryset.exclude(
                 Q(phone__startswith='06') | Q(phone__startswith='07')
             )
+        elif self.value() == 'mobile_only':
+            return queryset.filter(
+                Q(phone__startswith='06') | Q(phone__startswith='07')
+            )
+
         return queryset
diff --git a/sync/signals.py b/sync/signals.py
index f8559e0..d11cdf2 100644
--- a/sync/signals.py
+++ b/sync/signals.py
@@ -8,7 +8,7 @@ from authentication.models import Device
 from django.contrib.auth import get_user_model
 
 from .ws_sender import websocket_sender
-from .registry import device_registry, related_users_registry
+from .registry import device_registry, related_users_registry, model_registry
 
 import logging
 import traceback
@@ -53,8 +53,10 @@ def synchronization_notifications(sender, instance, created=False, **kwargs):
     # some classes are excluded in settings_app.py: SYNC_APPS
     if not isinstance(instance, BaseModel) and not isinstance(instance, User):
         return
-    # if isinstance(instance, DataAccess):
-    #     return
+
+    model_name = instance.__class__.__name__
+    if model_registry.get_model(model_name) is None:
+        return
 
     try:
         process_foreign_key_changes(sender, instance, **kwargs)
@@ -100,7 +102,6 @@ def save_model_log_if_possible(instance, signal, created):
         else:
             operation = ModelOperation.DELETE
 
-        model_name = instance.__class__.__name__
         store_id = None
         if isinstance(instance, SideStoreModel):
             store_id = instance.store_id
@@ -111,6 +112,7 @@ def save_model_log_if_possible(instance, signal, created):
         # user_ids = [user.id for user in users]
         # # print(f'users to notify: {user_ids}')
         # instance._users_to_notify = user_ids # save this for the post_save signal
+        model_name = instance.__class__.__name__
         save_model_log(users, operation, model_name, instance.id, store_id)
 
     else: