Not sure any notebook with sim card can do as not sure they take call.
Browsing the modern internet at 6kbs sounds painful.
When used in mobile phone networks, there are three different configurations (combinations of bitrates) that may be used for voice channels:
Configuration A (Config-WB-Code 0): 6.6, 8.85, and 12.65 kbit/s (Mandatory multi-rate configuration)
Configuration B (Config-WB-Code 2): 6.6, 8.85, 12.65, and 15.85 kbit/s
Configuration C (Config-WB-Code 4): 6.6, 8.85, 12.65, and 23.85 kbit/s*A couple of years later I bought one of the first smartphones. It was a Kyocera Palm Phone. On it I could use the native Palm PPP dialer and again it would use the phone as a modem and just use my minutes. It worked pretty well, though the Palm browser was lacking. I mostly just used it for email.