get sessions after paypal payment

Hey.
I want to send customer an sms when paypal payment is done. Try to get the sessions, like
session::$data['order']->data['payment_option']['id']
session::$data['order']->data["customer"]["phone"]

in order_success, but it doesnt work. Is there an easy way to do this in order_success ? Or I need to get those values in database by transaction_id ?