BSNL - get last 5 call details by sending an SMS

BSNL has recently launched an interesting service in which they will let their subscribers know about last five calls made using that SIM card. The details will include date, type, charge, balance, number and duration of the call(s).

Getting these details is pretty simple. All you need to do is send a simple SMS like this: 

LAST to 53733 to know about details of the last call made.
LAST FIVE or LAST5 to 53733 to know get details of last five calls.