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# imsi.py - functions for handling International Mobile Subscriber Identity
# (IMSI) numbers
#
# Copyright (C) 2011-2025 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""IMSI (International Mobile Subscriber Identity).
The IMSI (International Mobile Subscriber Identity) is used to identify
mobile phone users (the SIM).
>>> validate('429011234567890')
'429011234567890'
>>> validate('439011234567890') # unknown MCC
Traceback (most recent call last):
...
InvalidComponent: ...
>>> split('429011234567890')
('429', '01', '1234567890')
>>> split('310150123456789')
('310', '150', '123456789')
>>> info('460001234567890')['mcc']
'460'
>>> info('460001234567890')['country']
'China'
"""
from __future__ import annotations
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number: str) -> str:
"""Convert the IMSI number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' -').strip().upper()
def split(number: str) -> tuple[str, ...]:
"""Split the specified IMSI into a Mobile Country Code (MCC), a Mobile
Network Code (MNC), a Mobile Station Identification Number (MSIN)."""
# clean up number
number = compact(number)
# split the number
from stdnum import numdb
return tuple(numdb.get('imsi').split(number))
def validate(number: str) -> str:
"""Check if the number provided is a valid IMSI."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) not in (14, 15):
raise InvalidLength()
if len(split(number)) < 2:
raise InvalidComponent() # unknown MCC
return number
def info(number: str) -> dict[str, str]:
"""Return a dictionary of data about the supplied number."""
# clean up number
number = compact(number)
# split the number
from stdnum import numdb
info = dict(number=number)
mcc_info, mnc_info, msin_info = numdb.get('imsi').info(number)
info['mcc'] = mcc_info[0]
info.update(mcc_info[1])
info['mnc'] = mnc_info[0]
info.update(mnc_info[1])
info['msin'] = msin_info[0]
info.update(msin_info[1])
return info
def is_valid(number: str) -> bool:
"""Check if the number provided is a valid IMSI."""
try:
return bool(validate(number))
except ValidationError:
return False
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