diff --git a/pySim/ts_51_011.py b/pySim/ts_51_011.py
index 7413098..65bc85c 100644
--- a/pySim/ts_51_011.py
+++ b/pySim/ts_51_011.py
@@ -728,7 +728,7 @@
 # TS 51.011 Section 10.3.35..37
 class EF_xPLMNwAcT(TransRecEF):
     _test_de_encode = [
-        ( '62F2104000', { "mcc": "262", "mnc": "01", "act": [ "E-UTRAN" ] } ),
+        ( '62F2104000', { "mcc": "262", "mnc": "01", "act": [ "E-UTRAN NB-S1", "E-UTRAN WB-S1" ] } ),
         ( '62F2108000', { "mcc": "262", "mnc": "01", "act": [ "UTRAN" ] } ),
     ]
     def __init__(self, fid='1234', sfid=None, name=None, desc=None, size=(40, None), rec_len=5, **kwargs):
@@ -763,18 +763,18 @@
         if 'cdma2000 1xRTT' in in_list:
             u16 |= 0x0010
         # E-UTRAN
-        if 'E-UTRAN' in in_list:
+        if 'E-UTRAN WB-S1' in in_list and 'E-UTRAN NB-S1' in in_list:
             u16 |= 0x4000
-        if 'E-UTRAN WB-S1' in in_list:
+        elif 'E-UTRAN WB-S1' in in_list:
             u16 |= 0x6000
-        if 'E-UTRAN NB-S1' in in_list:
+        elif 'E-UTRAN NB-S1' in in_list:
             u16 |= 0x5000
         # GSM mess
         if 'GSM' in in_list and 'EC-GSM-IoT' in in_list:
             u16 |= 0x008C
         elif 'GSM' in in_list:
             u16 |= 0x0084
-        elif 'EC-GSM-IuT' in in_list:
+        elif 'EC-GSM-IoT' in in_list:
             u16 |= 0x0088
         return '%04X' % (u16)
 
diff --git a/pySim/utils.py b/pySim/utils.py
index aac9877..6523d98 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -486,33 +486,37 @@
 def dec_act(twohexbytes: Hexstr) -> List[str]:
     act_list = [
         {'bit': 15, 'name': "UTRAN"},
-        {'bit': 14, 'name': "E-UTRAN"},
         {'bit': 11, 'name': "NG-RAN"},
-        {'bit':  7, 'name': "GSM"},
         {'bit':  6, 'name': "GSM COMPACT"},
         {'bit':  5, 'name': "cdma2000 HRPD"},
         {'bit':  4, 'name': "cdma2000 1xRTT"},
     ]
     ia = h2i(twohexbytes)
     u16t = (ia[0] << 8) | ia[1]
-    sel = []
+    sel = set()
+    # only the simple single-bit ones
     for a in act_list:
         if u16t & (1 << a['bit']):
-            if a['name'] == "E-UTRAN":
-                # The Access technology identifier of E-UTRAN
-                # allows a more detailed specification:
-                if u16t & (1 << 13) and u16t & (1 << 12):
-                    sel.append("E-UTRAN WB-S1")
-                    sel.append("E-UTRAN NB-S1")
-                elif u16t & (1 << 13):
-                    sel.append("E-UTRAN WB-S1")
-                elif u16t & (1 << 12):
-                    sel.append("E-UTRAN NB-S1")
-                else:
-                    sel.append("E-UTRAN")
-            else:
-                sel.append(a['name'])
-    return sel
+            sel.add(a['name'])
+    # TS 31.102 Section 4.2.5 Table 4.2.5.1
+    eutran_bits = u16t & 0x7000
+    if eutran_bits == 0x4000 or eutran_bits == 0x7000:
+        sel.add("E-UTRAN WB-S1")
+        sel.add("E-UTRAN NB-S1")
+    elif eutran_bits == 0x5000:
+        sel.add("E-UTRAN NB-S1")
+    elif eutran_bits == 0x6000:
+        sel.add("E-UTRAN WB-S1")
+    # TS 31.102 Section 4.2.5 Table 4.2.5.2
+    gsm_bits = u16t & 0x008C
+    if gsm_bits == 0x0080 or gsm_bits == 0x008C:
+        sel.add("GSM")
+        sel.add("EC-GSM-IoT")
+    elif u16t & 0x008C == 0x0084:
+        sel.add("GSM")
+    elif u16t & 0x008C == 0x0086:
+        sel.add("EC-GSM-IoT")
+    return sorted(list(sel))
 
 
 def dec_xplmn_w_act(fivehexbytes: Hexstr) -> Dict[str, Any]:
diff --git a/pysim-testdata/Fairwaves-SIM.ok b/pysim-testdata/Fairwaves-SIM.ok
index 063fc6b..3751c57 100644
--- a/pysim-testdata/Fairwaves-SIM.ok
+++ b/pysim-testdata/Fairwaves-SIM.ok
@@ -31,7 +31,7 @@
 	ffffff0000 # unused
 
 HPLMNAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
diff --git a/pysim-testdata/Wavemobile-SIM.ok b/pysim-testdata/Wavemobile-SIM.ok
index 980332f..7a0ecec 100644
--- a/pysim-testdata/Wavemobile-SIM.ok
+++ b/pysim-testdata/Wavemobile-SIM.ok
@@ -11,7 +11,7 @@
 Hide in OPLMN: False
 PLMNsel: 00f110ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
 PLMNwAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
@@ -29,7 +29,7 @@
 	ffffff0000 # unused
 
 OPLMNwAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
diff --git a/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok b/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok
index 600c36d..873574c 100644
--- a/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok
+++ b/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok
@@ -89,11 +89,11 @@
 ===============================
 00 READ BINARY      MF/ADF.USIM/EF.HPPLMN               -        9000 5
 ===============================
-00 READ BINARY      MF/ADF.USIM/EF.HPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['UTRAN', 'E-UTRAN WB-S1', 'E-UTRAN NB-S1', 'NG-RAN', 'GSM', 'GSM COMPACT', 'cdma2000 HRPD', 'cdma2000 1xRTT']}, None, None, None, None, None, None, None, None, None, None, None]
+00 READ BINARY      MF/ADF.USIM/EF.HPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD']}, None, None, None, None, None, None, None, None, None, None, None]
 ===============================
-00 READ BINARY      MF/ADF.USIM/EF.PLMNwAcT             -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['UTRAN', 'E-UTRAN WB-S1', 'E-UTRAN NB-S1', 'NG-RAN', 'GSM', 'GSM COMPACT', 'cdma2000 HRPD', 'cdma2000 1xRTT']}, None, None, None, None, None, None, None, None, None, None, None]
+00 READ BINARY      MF/ADF.USIM/EF.PLMNwAcT             -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD']}, None, None, None, None, None, None, None, None, None, None, None]
 ===============================
-00 READ BINARY      MF/ADF.USIM/EF.OPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['UTRAN', 'E-UTRAN WB-S1', 'E-UTRAN NB-S1', 'NG-RAN', 'GSM', 'GSM COMPACT', 'cdma2000 HRPD', 'cdma2000 1xRTT']}, None, None, None, None, None, None, None, None, None, None, None]
+00 READ BINARY      MF/ADF.USIM/EF.OPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD']}, None, None, None, None, None, None, None, None, None, None, None]
 ===============================
 00 READ BINARY      MF/ADF.USIM/EF.FPLMN                -        9000 [{'mcc': '262', 'mnc': '01'}, {'mcc': '262', 'mnc': '02'}, {'mcc': '262', 'mnc': '03'}, None]
 ===============================
diff --git a/pysim-testdata/sysmoISIM-SJA2.ok b/pysim-testdata/sysmoISIM-SJA2.ok
index 45acd79..5640171 100644
--- a/pysim-testdata/sysmoISIM-SJA2.ok
+++ b/pysim-testdata/sysmoISIM-SJA2.ok
@@ -11,7 +11,7 @@
 Hide in OPLMN: True
 PLMNsel: 00f110ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
 PLMNwAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
@@ -25,7 +25,7 @@
 	ffffff0000 # unused
 
 OPLMNwAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
@@ -39,7 +39,7 @@
 	ffffff0000 # unused
 
 HPLMNAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
diff --git a/pysim-testdata/sysmoUSIM-SJS1.ok b/pysim-testdata/sysmoUSIM-SJS1.ok
index b793cc0..c909a89 100644
--- a/pysim-testdata/sysmoUSIM-SJS1.ok
+++ b/pysim-testdata/sysmoUSIM-SJS1.ok
@@ -11,7 +11,7 @@
 Hide in OPLMN: True
 PLMNsel: 00f110ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
 PLMNwAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
@@ -25,7 +25,7 @@
 	ffffff0000 # unused
 
 OPLMNwAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
@@ -39,7 +39,7 @@
 	ffffff0000 # unused
 
 HPLMNAcT:
-	00f110ffff # MCC: 001 MNC: 01 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, NG-RAN, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT
+	00f110ffff # MCC: 001 MNC: 01 AcT: E-UTRAN NB-S1, E-UTRAN WB-S1, EC-GSM-IoT, GSM, GSM COMPACT, NG-RAN, UTRAN, cdma2000 1xRTT, cdma2000 HRPD
 	ffffff0000 # unused
 	ffffff0000 # unused
 	ffffff0000 # unused
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 764cf71..062b614 100755
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -95,13 +95,13 @@
 		self.assertEqual(utils.dec_act("8000"), ["UTRAN"])
 
 	def testDecAct_onlyEUtran(self):
-		self.assertEqual(utils.dec_act("4000"), ["E-UTRAN"])
+		self.assertEqual(utils.dec_act("4000"), ["E-UTRAN NB-S1", "E-UTRAN WB-S1"])
 
 	def testDecAct_onlyNgRan(self):
 		self.assertEqual(utils.dec_act("0800"), ["NG-RAN"])
 
 	def testDecAct_onlyGsm(self):
-		self.assertEqual(utils.dec_act("0080"), ["GSM"])
+		self.assertEqual(utils.dec_act("0084"), ["GSM"])
 
 	def testDecAct_onlyGsmCompact(self):
 		self.assertEqual(utils.dec_act("0040"), ["GSM COMPACT"])
@@ -113,7 +113,7 @@
 		self.assertEqual(utils.dec_act("0010"), ["cdma2000 1xRTT"])
 
 	def testDecAct_allSet(self):
-		self.assertEqual(utils.dec_act("ffff"), ["UTRAN", "E-UTRAN WB-S1", "E-UTRAN NB-S1", "NG-RAN", "GSM", "GSM COMPACT", "cdma2000 HRPD", "cdma2000 1xRTT"])
+		self.assertEqual(utils.dec_act("ffff"), ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD'])
 
 	def testDecxPlmn_w_act(self):
 		expected = {'mcc': '295', 'mnc': '10', 'act': ["UTRAN"]}