Just bought one form a three shop, as my old defy is battered - scrathed screen, broken battery cover, dust under the screen missing usb port cover adn so on.
As i am already on three, i didnt have to pay for a £10 top up, and it only cost £69.99, the phone is completly unlocked and will work with any sim card.
here are a few stats from the about screen
system version 45.0.2310.MB526.Retail.en.GB
Android Version 2.3.6
Baseband version EPU93_U_00.60.03
Kernel Version: 184.108.40.206-ge281b6e hudsoncm@il93lnxdroid80#1
Build number 4.5.1-134_DFP-231