If its on Tmobile its generally locked to that network, although you can use Virgin sims in them as well as they share the same network (its Tmobiles though). Unlocking can be done at a cost of usually 5-10 quid at most phone specialists (think market stalls over places like the Link).
Orange lock their phones too, most o2 and Voda ones are not. The only issue is if you do get it unlocked, the voicemail and wap and sometimes messsage centre numbers need to be set up, not that difficult but if you sell it to someone and they have trouble they might moan.
Sell it on ebay, lots of people sell Tmobile phone, just put easy to unlock in the description.
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