But they are probably the most flexible way. Cell phones could not only be programmed to detonate explosives but also to be reprogrammed remotely.
So can a battery powered Wireless hub .... take a laptop from shore and something else (that I'm not mentioning) and run pings out to it .... you can imagine the rest.
Cellphones, flexible ... absolutely and it uses the public infrastructure against us ... but the internet could also be used to detonate one as well. Laptops, firewalls and 802.11 could be a detonator as well.