diff --git a/pySim/legacy/ts_51_011.py b/pySim/legacy/ts_51_011.py
new file mode 100644
index 0000000..a384b1d
--- /dev/null
+++ b/pySim/legacy/ts_51_011.py
@@ -0,0 +1,257 @@
+# -*- coding: utf-8 -*-
+
+""" Various constants from 3GPP TS 51.011 used by *legacy* code only.
+
+This will likely be removed in future versions of pySim.  Please instead
+use the pySim.filesystem class model with the various profile/application
+specific extension modules.
+"""
+
+# Copyright (C) 2017 Alexander.Chemeris <Alexander.Chemeris@gmail.com>
+# Copyright (C) 2021 Harald Welte <laforge@osmocom.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+MF_num = '3F00'
+
+DF_num = {
+    'TELECOM': '7F10',
+
+    'GSM': '7F20',
+    'IS-41': '7F22',
+    'FP-CTS': '7F23',
+
+    'GRAPHICS': '5F50',
+
+    'IRIDIUM': '5F30',
+    'GLOBST': '5F31',
+    'ICO': '5F32',
+    'ACeS': '5F33',
+
+    'EIA/TIA-553': '5F40',
+    'CTS': '5F60',
+    'SOLSA': '5F70',
+
+    'MExE': '5F3C',
+}
+
+EF_num = {
+    # MF
+    'ICCID': '2FE2',
+    'ELP': '2F05',
+    'DIR': '2F00',
+
+    # DF_TELECOM
+    'ADN': '6F3A',
+    'FDN': '6F3B',
+    'SMS': '6F3C',
+    'CCP': '6F3D',
+    'MSISDN': '6F40',
+    'SMSP': '6F42',
+    'SMSS': '6F43',
+    'LND': '6F44',
+    'SMSR': '6F47',
+    'SDN': '6F49',
+    'EXT1': '6F4A',
+    'EXT2': '6F4B',
+    'EXT3': '6F4C',
+    'BDN': '6F4D',
+    'EXT4': '6F4E',
+    'CMI': '6F58',
+    'ECCP': '6F4F',
+
+    # DF_GRAPHICS
+    'IMG': '4F20',
+
+    # DF_SoLSA
+    'SAI': '4F30',
+    'SLL': '4F31',
+
+    # DF_MExE
+    'MExE-ST': '4F40',
+    'ORPK': '4F41',
+    'ARPK': '4F42',
+    'TPRPK': '4F43',
+
+    # DF_GSM
+    'LP': '6F05',
+    'IMSI': '6F07',
+    'Kc': '6F20',
+    'DCK': '6F2C',
+    'PLMNsel': '6F30',
+    'HPPLMN': '6F31',
+    'CNL': '6F32',
+    'ACMmax': '6F37',
+    'SST': '6F38',
+    'ACM': '6F39',
+    'GID1': '6F3E',
+    'GID2': '6F3F',
+    'PUCT': '6F41',
+    'CBMI': '6F45',
+    'SPN': '6F46',
+    'CBMID': '6F48',
+    'BCCH': '6F74',
+    'ACC': '6F78',
+    'FPLMN': '6F7B',
+    'LOCI': '6F7E',
+    'AD': '6FAD',
+    'PHASE': '6FAE',
+    'VGCS': '6FB1',
+    'VGCSS': '6FB2',
+    'VBS': '6FB3',
+    'VBSS': '6FB4',
+    'eMLPP': '6FB5',
+    'AAeM': '6FB6',
+    'ECC': '6FB7',
+    'CBMIR': '6F50',
+    'NIA': '6F51',
+    'KcGPRS': '6F52',
+    'LOCIGPRS': '6F53',
+    'SUME': '6F54',
+    'PLMNwAcT': '6F60',
+    'OPLMNwAcT': '6F61',
+    # Figure 8 names it HPLMNAcT, but in the text it's names it HPLMNwAcT
+    'HPLMNAcT': '6F62',
+    'HPLMNwAcT': '6F62',
+    'CPBCCH': '6F63',
+    'INVSCAN': '6F64',
+    'PNN': '6FC5',
+    'OPL': '6FC6',
+    'MBDN': '6FC7',
+    'EXT6': '6FC8',
+    'MBI': '6FC9',
+    'MWIS': '6FCA',
+    'CFIS': '6FCB',
+    'EXT7': '6FCC',
+    'SPDI': '6FCD',
+    'MMSN': '6FCE',
+    'EXT8': '6FCF',
+    'MMSICP': '6FD0',
+    'MMSUP': '6FD1',
+    'MMSUCP': '6FD2',
+}
+
+DF = {
+    'TELECOM':  [MF_num, DF_num['TELECOM']],
+
+    'GSM':      [MF_num, DF_num['GSM']],
+    'IS-41':    [MF_num, DF_num['IS-41']],
+    'FP-CTS':   [MF_num, DF_num['FP-CTS']],
+
+    'GRAPHICS': [MF_num, DF_num['GRAPHICS']],
+
+    'IRIDIUM':  [MF_num, DF_num['IRIDIUM']],
+    'GLOBST':   [MF_num, DF_num['GLOBST']],
+    'ICO':      [MF_num, DF_num['ICO']],
+    'ACeS':     [MF_num, DF_num['ACeS']],
+
+    'EIA/TIA-553': [MF_num, DF_num['EIA/TIA-553']],
+    'CTS':      [MF_num, DF_num['CTS']],
+    'SoLSA':    [MF_num, DF_num['SOLSA']],
+
+    'MExE':     [MF_num, DF_num['MExE']],
+}
+
+
+EF = {
+    'ICCID':  [MF_num, EF_num['ICCID']],
+    'ELP':    [MF_num, EF_num['ELP']],
+    'DIR':    [MF_num, EF_num['DIR']],
+
+    'ADN':    DF['TELECOM']+[EF_num['ADN']],
+    'FDN':    DF['TELECOM']+[EF_num['FDN']],
+    'SMS':    DF['TELECOM']+[EF_num['SMS']],
+    'CCP':    DF['TELECOM']+[EF_num['CCP']],
+    'MSISDN': DF['TELECOM']+[EF_num['MSISDN']],
+    'SMSP':   DF['TELECOM']+[EF_num['SMSP']],
+    'SMSS':   DF['TELECOM']+[EF_num['SMSS']],
+    'LND':    DF['TELECOM']+[EF_num['LND']],
+    'SMSR':   DF['TELECOM']+[EF_num['SMSR']],
+    'SDN':    DF['TELECOM']+[EF_num['SDN']],
+    'EXT1':   DF['TELECOM']+[EF_num['EXT1']],
+    'EXT2':   DF['TELECOM']+[EF_num['EXT2']],
+    'EXT3':   DF['TELECOM']+[EF_num['EXT3']],
+    'BDN':    DF['TELECOM']+[EF_num['BDN']],
+    'EXT4':   DF['TELECOM']+[EF_num['EXT4']],
+    'CMI':    DF['TELECOM']+[EF_num['CMI']],
+    'ECCP':   DF['TELECOM']+[EF_num['ECCP']],
+
+    'IMG':    DF['GRAPHICS']+[EF_num['IMG']],
+
+    'SAI':    DF['SoLSA']+[EF_num['SAI']],
+    'SLL':    DF['SoLSA']+[EF_num['SLL']],
+
+    'MExE-ST': DF['MExE']+[EF_num['MExE-ST']],
+    'ORPK':   DF['MExE']+[EF_num['ORPK']],
+    'ARPK':   DF['MExE']+[EF_num['ARPK']],
+    'TPRPK':  DF['MExE']+[EF_num['TPRPK']],
+
+    'LP':     DF['GSM']+[EF_num['LP']],
+    'IMSI':   DF['GSM']+[EF_num['IMSI']],
+    'Kc':     DF['GSM']+[EF_num['Kc']],
+    'DCK':    DF['GSM']+[EF_num['DCK']],
+    'PLMNsel': DF['GSM']+[EF_num['PLMNsel']],
+    'HPPLMN': DF['GSM']+[EF_num['HPPLMN']],
+    'CNL':    DF['GSM']+[EF_num['CNL']],
+    'ACMmax': DF['GSM']+[EF_num['ACMmax']],
+    'SST':    DF['GSM']+[EF_num['SST']],
+    'ACM':    DF['GSM']+[EF_num['ACM']],
+    'GID1':   DF['GSM']+[EF_num['GID1']],
+    'GID2':   DF['GSM']+[EF_num['GID2']],
+    'PUCT':   DF['GSM']+[EF_num['PUCT']],
+    'CBMI':   DF['GSM']+[EF_num['CBMI']],
+    'SPN':    DF['GSM']+[EF_num['SPN']],
+    'CBMID':  DF['GSM']+[EF_num['CBMID']],
+    'BCCH':   DF['GSM']+[EF_num['BCCH']],
+    'ACC':    DF['GSM']+[EF_num['ACC']],
+    'FPLMN':  DF['GSM']+[EF_num['FPLMN']],
+    'LOCI':   DF['GSM']+[EF_num['LOCI']],
+    'AD':     DF['GSM']+[EF_num['AD']],
+    'PHASE':  DF['GSM']+[EF_num['PHASE']],
+    'VGCS':   DF['GSM']+[EF_num['VGCS']],
+    'VGCSS':  DF['GSM']+[EF_num['VGCSS']],
+    'VBS':    DF['GSM']+[EF_num['VBS']],
+    'VBSS':   DF['GSM']+[EF_num['VBSS']],
+    'eMLPP':  DF['GSM']+[EF_num['eMLPP']],
+    'AAeM':   DF['GSM']+[EF_num['AAeM']],
+    'ECC':    DF['GSM']+[EF_num['ECC']],
+    'CBMIR':  DF['GSM']+[EF_num['CBMIR']],
+    'NIA':    DF['GSM']+[EF_num['NIA']],
+    'KcGPRS': DF['GSM']+[EF_num['KcGPRS']],
+    'LOCIGPRS': DF['GSM']+[EF_num['LOCIGPRS']],
+    'SUME':   DF['GSM']+[EF_num['SUME']],
+    'PLMNwAcT': DF['GSM']+[EF_num['PLMNwAcT']],
+    'OPLMNwAcT': DF['GSM']+[EF_num['OPLMNwAcT']],
+    # Figure 8 names it HPLMNAcT, but in the text it's names it HPLMNwAcT
+    'HPLMNAcT': DF['GSM']+[EF_num['HPLMNAcT']],
+    'HPLMNwAcT': DF['GSM']+[EF_num['HPLMNAcT']],
+    'CPBCCH': DF['GSM']+[EF_num['CPBCCH']],
+    'INVSCAN': DF['GSM']+[EF_num['INVSCAN']],
+    'PNN':    DF['GSM']+[EF_num['PNN']],
+    'OPL':    DF['GSM']+[EF_num['OPL']],
+    'MBDN':   DF['GSM']+[EF_num['MBDN']],
+    'EXT6':   DF['GSM']+[EF_num['EXT6']],
+    'MBI':    DF['GSM']+[EF_num['MBI']],
+    'MWIS':   DF['GSM']+[EF_num['MWIS']],
+    'CFIS':   DF['GSM']+[EF_num['CFIS']],
+    'EXT7':   DF['GSM']+[EF_num['EXT7']],
+    'SPDI':   DF['GSM']+[EF_num['SPDI']],
+    'MMSN':   DF['GSM']+[EF_num['MMSN']],
+    'EXT8':   DF['GSM']+[EF_num['EXT8']],
+    'MMSICP': DF['GSM']+[EF_num['MMSICP']],
+    'MMSUP':  DF['GSM']+[EF_num['MMSUP']],
+    'MMSUCP': DF['GSM']+[EF_num['MMSUCP']],
+}
+