Most carriers do have two types of APN (Access Point Name) provision for the SIM: "private" APN (which provides a non-routable IP assignment from behind a NAT, for basic browsing and e-mail functionality) and "public" APN (that provides a routable IP assignment, which is the Minimum Requirement for a more sophisticated connection type, such as VPN, etc).
However, both of them are assigned by a DHCP (Dynamic Host Configuration Protocol) Server on a GGSN (Gateway GPRS Support Node) of the particular GPRS network operator. In either case, the end result is a DYNAMIC IP address on the GPRS terminal (be it a laptop PC, a PDA, or phone).
Some carriers do offer what is called a "dedicated APN" provision, which gives the subscriber their own IP range to choose from (almost like a small subnet).
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