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Two problems in interfacing GSM Modem

I am interfacing a Benq M22 module based GSM modem with my PC and making an application which perform different purposes for SMS. I need to know that which AT command can be used to receive the SMS delivery reports ? I've tried to search AT+CNMI in different modes but this don't work in any case.
The other problem I am facing that since I am using the Text mode to send SMS how can I send long SMS, i.e. more than 160 characters? Please help.