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Hi,
I have an inbuilt Lexus phone and manual (printed in Belguim)
Part No.PZ409-F1272-P1
Do you have a corded handset in the armrest?
Have you inserted your own sim card?
The three small buttons are for making handsfree calls using your own pre-set numbers, twelve in all using combinations of 1, 2, 3, 11,12, 13, 21, 22, 23, 31, 32,33. These are easily dialled by pressing your pre-set number and pulling the Dial Bar towards you, (dialling is easy indentified by the radio system muting automatically).
If your system is the same as mine then auto answer after two rings can also be programmed.
The microphone is also part of that control unit on the steering wheel.
Regards & hope this helps.
Steevee Leevee