NicAx64 76 Posting Pro

hi all,
I got the HSPDA modem , and I want a packet analyzer (sniffer) for that.
Could somebody suggest me a name of a good sniffer for HSPDA ?
or is it possible to capture the UTMS packets over the Modem Without
going deep into the modem firmware?

in linux it installed as a modem.
and it uses the modem AT commands.How to dig without hacking the firmware?
any idea?

--Thanks in advance--