diff --git a/tests/hwsim/test_ap_eap.py b/tests/hwsim/test_ap_eap.py
index c75271226..c8d6f4842 100644
--- a/tests/hwsim/test_ap_eap.py
+++ b/tests/hwsim/test_ap_eap.py
@@ -416,6 +416,128 @@ def test_ap_wpa2_eap_aka_ext(dev, apdev):
     ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
     if ev is None:
         raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTS:112233445566778899aabbccddee"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTS:12"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTH:34"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTH:00112233445566778899aabbccddeeff.00112233445566778899aabbccddeeff:0011223344"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTH:00112233445566778899aabbccddeeff:00112233445566778899aabbccddee:0011223344"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTH:00112233445566778899aabbccddeeff:00112233445566778899aabbccddeeff.0011223344"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTH:00112233445566778899aabbccddeeff:00112233445566778899aabbccddeeff:00112233445566778899aabbccddeeff0011223344"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
+    dev[0].request("DISCONNECT")
+
+    dev[0].select_network(id, freq="2412")
+    ev = dev[0].wait_event(["CTRL-REQ-SIM"], timeout=15)
+    if ev is None:
+        raise Exception("Wait for external SIM processing request timed out")
+    p = ev.split(':', 2)
+    if p[1] != "UMTS-AUTH":
+        raise Exception("Unexpected CTRL-REQ-SIM type")
+    rid = p[0].split('-')[3]
+    # This will fail during UMTS auth validation
+    if "OK" not in dev[0].request("CTRL-RSP-SIM-" + rid + ":UMTS-AUTH:00112233445566778899aabbccddeeff:00112233445566778899aabbccddeeff:001122334q"):
+        raise Exception("CTRL-RSP-SIM failed")
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-FAILURE"], timeout=15)
+    if ev is None:
+        raise Exception("EAP failure not reported")
 
 def test_ap_wpa2_eap_aka_prime(dev, apdev):
     """WPA2-Enterprise connection using EAP-AKA'"""