diff --git a/pySim/card_key_provider.py b/pySim/card_key_provider.py
index 561418f4..837249d0 100644
--- a/pySim/card_key_provider.py
+++ b/pySim/card_key_provider.py
@@ -231,6 +231,8 @@ def card_key_provider_get(fields, key: str, value: str, provider_list=card_key_p
     Returns:
             dictionary of {field, value} strings for each requested field from 'fields'
     """
+    key = key.upper()
+    fields = [f.upper() for f in fields]
     for p in provider_list:
         if not isinstance(p, CardKeyProvider):
             raise ValueError(
@@ -252,6 +254,8 @@ def card_key_provider_get_field(field: str, key: str, value: str, provider_list=
     Returns:
             dictionary of {field, value} strings for the requested field
     """
+    key = key.upper()
+    field = field.upper()
     for p in provider_list:
         if not isinstance(p, CardKeyProvider):
             raise ValueError(
diff --git a/tests/unittests/test_card_key_provider.py b/tests/unittests/test_card_key_provider.py
index bbe76e8e..121998cc 100644
--- a/tests/unittests/test_card_key_provider.py
+++ b/tests/unittests/test_card_key_provider.py
@@ -66,6 +66,11 @@ class TestCardKeyProviderCsv(unittest.TestCase):
                                             "KIC2","KIC3","KID1","KID2","KID3","KIK1","KIK2","KIK3","OPC"],
                                            "ICCID", t.get('ICCID'))
             self.assertEqual(result, t.get('EXPECTED'))
+            result = card_key_provider_get(["PIN1","puk1","PIN2","PUK2","KI","adm1","ADM2","KIC1",
+                                            "KIC2","kic3","KID1","KID2","KID3","kik1","KIK2","KIK3","OPC"],
+                                           "iccid", t.get('ICCID'))
+            self.assertEqual(result, t.get('EXPECTED'))
+
 
     def test_card_key_provider_get_field(self):
         test_data = [{'EXPECTED' : "3eb8567fa0b4b1e63bcab13bff5f2702", 'ICCID' :"8988211000000000001"},
@@ -75,6 +80,10 @@ class TestCardKeyProviderCsv(unittest.TestCase):
         for t in test_data:
             result = card_key_provider_get_field("KIC1", "ICCID", t.get('ICCID'))
             self.assertEqual(result, t.get('EXPECTED'))
+        for t in test_data:
+            result = card_key_provider_get_field("kic1", "iccid", t.get('ICCID'))
+            self.assertEqual(result, t.get('EXPECTED'))
+
 
 class TestCardKeyFieldCryptor(unittest.TestCase):