Cell phone "phreaking" and ESN/MEID/IMEI crew, they're fun but it's now gotten to the point where it's for profit vs how Qualcomm doesn't care.

Half the people are privacy adverse, the other half just profitters.

Still, interesting to modify and manipulate hardware and software on cell phones, although the scene is very different (and more complicated) then 05 (where you could replace the $SYS.ESN file in Hex and checksum to get a new valid ESN)