UK PAYG: Simlock question

[stu.h]

Ive found out that Vodafone are doing the 4S for £480 or thereabouts.

Now, carphone warehouse are saying that with the PAYG handsets are only locked to the FIRST SIM that is put in the phone.

Therefore, if I got a PAYG 4S on any network, and I put my O2 SIM in first, it should be then locked to O2, right?

I've scowered the interwebs for a definitive answer, but couldn't really find much.

 

[crunkcrumpet]

CPW are right, the phone will lock when the sim is put in the phone.

 

[androiphone]

a sim free iPhone 4S is £499, is it worth it saving £19? note you will likely have to spend £20 to get it unlocked in the future. (also do you have to buy a compulsory top up on PAYG?)

just buy it sim free straight up, don't waste your time getting a PAYG model.