Register date and time of lost call - tc35i

I have got a siemens TC35i modem. I want to know when I receive a lost call, but listing the missed call memory I only receive the telephone number list of missed calls (not the date and time). Is there any other gsm modem that register the date and time of the lost calls?

I can sovle my problem too deleting the missed calls list, but I can't do it:

1) I choose missed calls phonebook (AT+CPBS=MC).
Answer is: OK
2) Then read entries with AT+CPBR=1,10.
Answer is: +CPBR: 1,"+abcdefghij",145,""
3) Finaly try to delete this entry with AT+CPBW=1. But MC phonebook is
read only and I am not phone replies ERROR.

Can you help me?
Thanks.