diff --git a/pySim/cards.py b/pySim/cards.py
index ac6d2235..a8dcf104 100644
--- a/pySim/cards.py
+++ b/pySim/cards.py
@@ -1287,6 +1287,17 @@ class SysmoISIMSJA2(UsimCard, IsimCard):
 			r = self._scc.select_file(['3f00', '7f10'])
 			data, sw = self._scc.update_record('6f42', 1, lpad(p['smsp'], 104), force_len=True)
 
+		# EF.MSISDN
+		# TODO: Alpha Identifier (currently 'ff'O * 20)
+		# TODO: Capability/Configuration1 Record Identifier
+		# TODO: Extension1 Record Identifier
+		if p.get('msisdn') is not None:
+			msisdn = enc_msisdn(p['msisdn'])
+			content = 'ff' * 20 + msisdn + 'ff' * 2
+
+			r = self._scc.select_file(['3f00', '7f10'])
+			data, sw = self._scc.update_record('6F40', 1, content, force_len=True)
+
 		# Populate AIDs
 		self.read_aids()
 
diff --git a/pysim-testdata/sysmoISIM-SJA2.ok b/pysim-testdata/sysmoISIM-SJA2.ok
index 26e20b00..b521c6dd 100644
--- a/pysim-testdata/sysmoISIM-SJA2.ok
+++ b/pysim-testdata/sysmoISIM-SJA2.ok
@@ -53,7 +53,7 @@ HPLMNAcT:
 	ffffff0000 # unused
 
 ACC: 0200
-MSISDN: Not available
+MSISDN (NPI=1 ToN=3): 6766266
 Administrative data: 00000002
 	MS operation mode: normal operation
 	Ciphering Indicator: disabled