diff --git a/mbtk/mbtk_rild_v2/src/ril_data_call.c b/mbtk/mbtk_rild_v2/src/ril_data_call.c
index 8b42772..a9ebd12 100755
--- a/mbtk/mbtk_rild_v2/src/ril_data_call.c
+++ b/mbtk/mbtk_rild_v2/src/ril_data_call.c
@@ -385,10 +385,17 @@
     // Delete apn
     if(str_empty(apn->apn)) {
         if(apn->cid == MBTK_RIL_CID_NUL)
+        {
+            LOGE("null cid %d can't be delete",apn->cid);
             return -1;
+        }
+            
 
         if(asr_auto_data_call_enable() && apn->cid == MBTK_RIL_CID_DEF)
+        {
+            LOGE("cid %d can't be delete",apn->cid);
             return -1;
+        }
 
         // The cid no use,so can not delete.
         mbtk_apn_info_array_t apns;
@@ -407,6 +414,7 @@
                     return 0;
                 index++;
             }
+            LOGE("local apn list  don't include cid %d to be delete.",apn->cid);
             return -1;
         }
     } else { // Add or change APN.