[android-developers] TelephonyManager.listen() additive? API docs unclear.

If I register LISTEN_SERVICESTATE with listener "A" using
TelephonyManager.listen(), and then later I need to additionally
listen another event like LISTEN_CALL_STATE *using the same
listener* ... do I need to:

(1) unregister listener A with LISTEN_NONE and re-register with both
LISTEN_ flags:

TelephonyManager t = ...;
PhoneStateListener l = ...;

t.listen( l, LISTEN_SERVICESTATE);
...
time goes by
...
t.listen( l, LIST_NONE);
t.listen( l, LISTEN_SERVICE_STATE | LISTEN_CALL_STATE)

(2) simply call listen again with listener A, and the new flag.
t.listen( l, LISTEN_SERVICESTATE);
t.listen( l, LISTEN_CALL_STATE);

In other words, is listen() additive if you pass in the same listener
with different LISTEN_ flags? The documentation is not clear.

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