Technology lock-in. Admittedly, it's rather pointless for me to argue this, thanks to phones locked to specific carriers, but competition is severely hindered

Technology lock-in. Admittedly, it's rather pointless for me to argue this, thanks to phones locked to specific carriers, but competition is severely hindered by the fact that I can't just pop in a new SIM from a different GSM carrier. Instead, I have to buy a new handset and, as phones become mobile computing devices, I'll have quite a lot of setup and data porting to do.