using modem pool with 8 port

[heo899]

Hello
I want to use modem pool 8 ports,
I am wondering how i can use all 8 ports to send a large number of SMS

I want to know how can I know if some port is ready to send sms after previouse sendAndWaitRefID,  so that after sending sms by one port, automatically send another sms by another port.

Thanks