diff --git a/mbtk/libgsw_lib/gsw_sim_interface.c b/mbtk/libgsw_lib/gsw_sim_interface.c
index a3f66d6..97be112 100755
--- a/mbtk/libgsw_lib/gsw_sim_interface.c
+++ b/mbtk/libgsw_lib/gsw_sim_interface.c
@@ -6,9 +6,9 @@
 #define MBTK_BUFF_TEMP_SIZE_32  32
 #define MBTK_ERR_OK             0
 #define MBTK_ERR_FAIL             -1
-#define GSW_SIM_ICCID_LENGTH 20+1 
-#define GSW_SIM_IMSI_LENGTH 20+1 
-#define GSW_SIM_MSISDN_LENGTH 20+1
+#define GSW_SIM_ICCID_LENGTH 15+1 
+#define GSW_SIM_IMSI_LENGTH 15+1 
+#define GSW_SIM_MSISDN_LENGTH 15+1
 
 //mbtk include
 typedef unsigned int uint32;