diff --git a/care/utils/models/validators.py b/care/utils/models/validators.py
index 58624d1143..9b7a3e3581 100644
--- a/care/utils/models/validators.py
+++ b/care/utils/models/validators.py
@@ -1,5 +1,5 @@
 import re
-from collections.abc import Iterable
+from collections.abc import Collection, Iterable
 from fractions import Fraction
 from pathlib import Path
 
@@ -103,9 +103,23 @@ class PhoneNumberValidator(RegexValidator):
         "support": support_number_regex,
     }
 
-    def __init__(self, types: Iterable[str], *args, **kwargs):
-        if not isinstance(types, Iterable) or isinstance(types, str) or len(types) == 0:
-            msg = "The `types` argument must be a non-empty iterable."
+    def __init__(self, types: Collection[str], *args, **kwargs):
+        if not isinstance(types, Collection) or isinstance(types, str):
+            msg = "The `types` argument must be a non-empty collection."
+            raise ValueError(msg)
+
+        types = tuple(types)
+        if not types:
+            msg = "The `types` argument must be a non-empty collection."
+            raise ValueError(msg)
+
+        unsupported_types = [
+            type_
+            for type_ in types
+            if not isinstance(type_, str) or type_ not in self.regex_map
+        ]
+        if unsupported_types:
+            msg = f"Unsupported phone number type(s): {', '.join(str(type_) for type_ in unsupported_types)}."
             raise ValueError(msg)
 
         self.types = types
diff --git a/care/utils/tests/test_phone_number_validator.py b/care/utils/tests/test_phone_number_validator.py
index 5f378c9954..f29b020e6e 100644
--- a/care/utils/tests/test_phone_number_validator.py
+++ b/care/utils/tests/test_phone_number_validator.py
@@ -130,3 +130,40 @@ def test_invalid_support_numbers(self):
         for number in self.invalid_support_numbers:
             with self.assertRaises(ValidationError, msg=f"Failed for {number}"):
                 self.support_validator(number)
+
+    def test_types_must_be_non_empty_collection(self):
+        invalid_types = ["mobile", (), (type_ for type_ in ("mobile",))]
+
+        for types in invalid_types:
+            with self.assertRaisesMessage(
+                ValueError,
+                "The `types` argument must be a non-empty collection.",
+            ):
+                PhoneNumberValidator(types=types)
+
+    def test_unsupported_types_raise_value_error(self):
+        with self.assertRaisesMessage(
+            ValueError,
+            "Unsupported phone number type(s): pager.",
+        ):
+            PhoneNumberValidator(types=("mobile", "pager"))
+
+    def test_unhashable_types_raise_value_error(self):
+        with self.assertRaisesMessage(
+            ValueError,
+            "Unsupported phone number type(s): [].",
+        ):
+            PhoneNumberValidator(types=([],))
+
+    def test_non_string_types_raise_value_error(self):
+        with self.assertRaisesMessage(
+            ValueError,
+            "Unsupported phone number type(s): 1.",
+        ):
+            PhoneNumberValidator(types=(1,))
+
+    def test_types_accepts_reiterable_collection(self):
+        validator = PhoneNumberValidator(types=["mobile", "landline"])
+
+        self.assertIsNone(validator("+919876543210"))
+        self.assertIsNone(validator("+914902626488"))