diff --git a/autotests/util/ofono.py b/autotests/util/ofono.py
new file mode 100644
index 00000000..2bc6338b
--- /dev/null
+++ b/autotests/util/ofono.py
@@ -0,0 +1,47 @@
+import dbus
+from gi.repository import GLib
+
+SIM_AUTH_IFACE = 'org.ofono.SimAuthentication'
+
+class Ofono(dbus.service.Object):
+    def __init__(self):
+        self._bus = dbus.SystemBus()
+
+    def enable_modem(self, path):
+        self._modem_path = path
+        self._modem_iface = dbus.Interface(
+                                        self._bus.get_object('org.ofono', path),
+                                        'org.ofono.Modem')
+        self._modem_iface.SetProperty("Powered", dbus.Boolean(1),
+                                       timeout = 120)
+
+    def _modem_prop_changed(self, property, changed):
+        if property == 'Interfaces':
+            if SIM_AUTH_IFACE in changed:
+                self._sim_auth_up = True
+
+    def wait_for_sim_auth(self, max_wait = 15):
+        mainloop = GLib.MainLoop()
+        self._sim_auth_up = False
+
+        props = self._modem_iface.GetProperties()
+        if SIM_AUTH_IFACE in props['Interfaces']:
+            self._sim_auth_up = True
+            return
+
+        self._modem_iface.connect_to_signal('PropertyChanged',
+                                             self._modem_prop_changed)
+
+        self._wait_timed_out = False
+        def wait_timeout_cb():
+            self._wait_timed_out = True
+            return False
+
+        timeout = GLib.timeout_add_seconds(max_wait, wait_timeout_cb)
+        context = mainloop.get_context()
+        while (not self._sim_auth_up):
+            context.iteration(may_block=True)
+            if self._wait_timed_out:
+                raise TimeoutError('waiting for SimAuthentication timed out')
+
+        GLib.source_remove(timeout)