The following are the at commands supported by the 8310:
ATA
ATD
ATDT
ATE
ATH
ATI
ATL
ATM
ATO
ATQ
ATS
ATV
ATX
ATZ
AT&C
AT&D
AT&F
AT+CBC
AT+CFUN
AT+CGATT
AT+CGDCONT
AT+CGMI
AT+CGMM
AT+CGMR
AT+CGREG
AT+CGSN
AT+CGQMIN
AT+CGQREQ
AT+CGEQMIN
AT+CGEQREQ
AT+CHUP
AT+CIMI
AT+CLAC
AT+COPS
AT+CNUM
AT+CPAS
AT+CPIN
AT+CSCS
AT+CSQ
AT+CREG
AT+GCAP
AT+GMI
AT+GMM
AT+GMR
AT+GSN
AT+RIMMOLR
AT+RIMMTLN
AT+RIMRADIO

Use pppob from the Barry project to start a session similar to a minicom or HyperTerminal session.

In response to some queries I've seen on the forums, the AT commands do not support SMS (sending or writing).

Here are some resources on the functionality of the AT commands:
http://webapp.etsi.org/exchangefolde...16v070800p.pdf
AT Commands - Forum Nokia Wiki

Please add to this post if your BlackBerry supports different commands. You can get a list of supported commands by issuing the command at+clac

Still trying to figure out why this was so important that you posted 10 useless posts just so you could post these links....