There are already portable VoIP phones which use 801.11b. And I read that there are chips in development which can do both 802.11b and GSM. (And Nokia already sells a PCMCIA card which can do both.)
I predict that telcos will soon be fighting free wireless networks like the RIAA is fighting file sharing networks today.
All global namespaces should really be built upon cryptographically secure hashes. Static content should be indentified by content hashes. (Even MSG-IDs of emails and usenet posts should be content hashes.) Every hash of a public key should be the root of a namespace which is owned by the owner of the public key. This would solve a lot of problems of the existing internet. A lot of 404s would never occur. All the problems of the domain name system would be solved too. And last but not least: All communication could be encrypted automatically and transparently to the user.