"unlocked phones" mean that you are not restricted to using one service provider and you can just change your SIM cards to subscribe to a new service.
But this still does not mean that you can change the operating system of your phone hardware.
This is the bootloader. Unlocking the bootloader gives you to freedom to flash community developed Android variants.
HTC's commitment is to unlocking the bootloader - not the service provider SIM unlock (though you might be able to do so - however they are NOT the same thing)
Carrier lockdown only happens when you buy a phone under contract. You can buy unlocked phones, easy.
But they are so expensive!!!!
Well, yeah, that's because you're paying the real price, not a subsidized price. When you're paying the subsidized price, IMHO you have less leeway to complain about carrier lockdown.
Well, just for the record, I bought a heavily subsidized Galaxy S sim-unlocked with a 2 year contract (the cost was something like $30). Gave it to my wife, then bought myself a SG II. And I'm happily paying for my contract btw.
The carrier I'm talking about is a smaller one from Europe. It's unthinkable to ask this of Vodafone or Orange (the 2 big ones) since their heads are really up their buts. And the unlocking prices they charge are freakin` insane! It's not as if carriers can't do this, they just don't want to.
I really don't understand what's their problem. If I'm terminating my contract I have to pay the phone's subsidized price for the months remaining, their only loss is me as their customer, so WTF is the deal with sim-locked phones? I hate it when companies, instead of pleasing customers, are innovating in better lock-in methods.
But yes, I was talking about bootloader-unlock in my previous message. Really, Nexus S is the best Android sold right now, unfortunately it was only available from Vodafone and I'll never make a contract with Vodafone again.
I bought a Wildfire which was locked to Vodafone. I took it to the nearest Vodafone shop and they unlocked it for me without charge. I was surprised and highly pleased until I realised that removing the sim-lock does not remove the lock on the bootloader.
I've found it depends where you get the phone. All the phones I've got from Carphone Warehouse have been unlocked, all the ones from operator shops have been locked.
If that were true, an unlocked phone should cost less per month in subscription fees since it is not being subsidized by the carrier. No US carrier does this.
If I want to buy a new phone I can either pay full price for an unlocked one, get a small subsidy to lock myself to a carrier for 12 or 24 months, or I can get an even bigger subsidy by paying an increased subscription price for 12 or 24 months.
As an owner of an unlocked phone, that would be awesome. It's probably still very uncommon to buy an unlocked phone though, and the carriers don't want to give up money. As it grows more common, maybe I will get to see that day.