LG MM-535 Owner's Manual page 137

With Three-Way Calling, you can talk to two people at the same time.
When using this feature, the normal airtime rates will be charged for
each of the two calls.
Enter a number you wish to call and press
Once you have established the connection, enter the second
number you wish to call and press
caller on hold and dials the second number.)
When you're connected to the second party, press
begin your three-way call.
If one of the people you called hangs up during your call, you and the
remaining caller stay connected. If you initiated the call and are the
first to hang up, all three callers are disconnected.
.
. (This puts the first
again to