diff --git a/contact.xlsx b/contact.xlsx
index 8f29640..217c10f 100644
Binary files a/contact.xlsx and b/contact.xlsx differ
diff --git a/db/DbManager.py b/db/DbManager.py
index 7106046..cc728cf 100644
--- a/db/DbManager.py
+++ b/db/DbManager.py
@@ -52,17 +52,23 @@ class DataManager:
 
 
 if __name__ == '__main__':
-    # Create a workbook and add a worksheet.
-    workbook = xlsxwriter.Workbook('sim_infos.xlsx')
-    worksheet = workbook.add_worksheet()
+
     # Start from the first cell. Rows and columns are zero indexed.
-    row = 0
-    col = 0
+    sim_info_list = []
+
     for sim in params.firebase_store_manager.get_all_sim_infos().stream():
         print(sim)
         sim_pojo = SimInfoPojo.from_firestore_dict(sim.to_dict())
+        sim_info_list.append(sim_pojo)
+    row = 0
+    col = 0
+    # Create a workbook and add a worksheet.
+    workbook = xlsxwriter.Workbook('sim_infos.xlsx')
+    worksheet = workbook.add_worksheet()
+    for info in sim_info_list:
         # Iterate over the data and write it out row by row.
-        worksheet.write(row, col, sim_pojo.phone[2:len(sim_pojo.phone)])
-        worksheet.write(row, col + 1, sim_pojo.ccid)
+        worksheet.write(row, col, info.phone[2:len(info.phone)])
+        worksheet.write(row, col + 1, info.ccid)
+        worksheet.write(row, col + 2, info.position)
         row += 1
     workbook.close()
diff --git a/db/sim_infos.xlsx b/db/sim_infos.xlsx
deleted file mode 100644
index ba5288a..0000000
Binary files a/db/sim_infos.xlsx and /dev/null differ
diff --git a/pojo/SimInfoPojo.py b/pojo/SimInfoPojo.py
index f38cd35..075ac0d 100644
--- a/pojo/SimInfoPojo.py
+++ b/pojo/SimInfoPojo.py
@@ -18,8 +18,12 @@ class SimInfoPojo:
     def from_firestore_dict(source):
         phone = source['phone']
         ccid = source['ccid']
-        update_at = source['update_at']
-        position = source['position']
+        update_at = None
+        if 'update_at' in source:
+            update_at = source['update_at']
+        position = None
+        if 'position' in source:
+            position = source['position']
         result = SimInfoPojo(phone=phone, ccid=ccid, update_at=update_at, position=position)
         result.id = id
         return result