This file is indexed.

/usr/share/ofono/scripts/set-msisdn is in ofono-scripts 1.21-1ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/python3

import dbus
import sys

bus = dbus.SystemBus()

if len(sys.argv) == 3:
	path = sys.argv[1]
	number = sys.argv[2]
elif len(sys.argv) == 2:
	manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
	modems = manager.GetModems()
	path = modems[0][0]
	number = sys.argv[1]
else:
	print("%s [PATH] <number>" % (sys.argv[0]))
	exit(1)

print("Setting MSISDN for modem %s..." % path)
sim = dbus.Interface(bus.get_object('org.ofono', path), 'org.ofono.SimManager')

sim.SetProperty("SubscriberNumbers", [number]);