diff --git a/pySim/utils_test.py b/pySim/utils_test.py
new file mode 100644
index 0000000..ff028da
--- /dev/null
+++ b/pySim/utils_test.py
@@ -0,0 +1,76 @@
+#!/usr/bin/pyton
+
+import unittest
+import utils 
+
+class DecTestCase(unittest.TestCase):
+
+	def testSplitHexStringToListOf5ByteEntries(self):
+		input_str = "ffffff0003ffffff0002ffffff0001"
+		expected = [
+			"ffffff0003",
+			"ffffff0002",
+			"ffffff0001",
+		]
+		self.assertEqual(utils.hexstr_to_fivebytearr(input_str), expected)
+
+	def testDecMCCfromPLMN(self):
+		self.assertEqual(utils.dec_mcc_from_plmn("92f501"), 295)
+
+	def testDecMCCfromPLMN_unused(self):
+		self.assertEqual(utils.dec_mcc_from_plmn("ff0f00"), 4095)
+
+	def testDecMNCfromPLMN_twoDigitMNC(self):
+		self.assertEqual(utils.dec_mnc_from_plmn("92f501"), 10)
+
+	def testDecMNCfromPLMN_threeDigitMNC(self):
+		self.assertEqual(utils.dec_mnc_from_plmn("031263"), 361)
+
+	def testDecMNCfromPLMN_unused(self):
+		self.assertEqual(utils.dec_mnc_from_plmn("00f0ff"), 4095)
+
+	def testDecAct_noneSet(self):
+		self.assertEqual(utils.dec_act("0000"), [])
+
+	def testDecAct_onlyUtran(self):
+		self.assertEqual(utils.dec_act("8000"), ["UTRAN"])
+
+	def testDecAct_onlyEUtran(self):
+		self.assertEqual(utils.dec_act("4000"), ["E-UTRAN"])
+
+	def testDecAct_onlyGsm(self):
+		self.assertEqual(utils.dec_act("0080"), ["GSM"])
+
+	def testDecAct_onlyGsmCompact(self):
+		self.assertEqual(utils.dec_act("0040"), ["GSM COMPACT"])
+
+	def testDecAct_onlyCdma2000HRPD(self):
+		self.assertEqual(utils.dec_act("0020"), ["cdma2000 HRPD"])
+
+	def testDecAct_onlyCdma20001xRTT(self):
+		self.assertEqual(utils.dec_act("0010"), ["cdma2000 1xRTT"])
+
+	def testDecAct_allSet(self):
+		self.assertEqual(utils.dec_act("ffff"), ["UTRAN", "E-UTRAN", "GSM", "GSM COMPACT", "cdma2000 HRPD", "cdma2000 1xRTT"])
+
+	def testDecxPlmn_w_act(self):
+		expected = {'mcc': 295, 'mnc': 10, 'act': ["UTRAN"]}
+		self.assertEqual(utils.dec_xplmn_w_act("92f5018000"), expected)
+
+	def testFormatxPlmn_w_act(self):
+		input_str = "92f501800092f5508000ffffff0000ffffff0000ffffff0000ffffff0000ffffff0000ffffff0000ffffff0000ffffff0000"
+		expected = '''92f5018000 # MCC: 295 MNC:  10 AcT: UTRAN
+92f5508000 # MCC: 295 MNC:   5 AcT: UTRAN
+ffffff0000 # unused
+ffffff0000 # unused
+ffffff0000 # unused
+ffffff0000 # unused
+ffffff0000 # unused
+ffffff0000 # unused
+ffffff0000 # unused
+ffffff0000 # unused
+'''
+		self.assertEqual(utils.format_xplmn_w_act(input_str), expected)
+
+if __name__ == "__main__":
+	unittest.main()