unlocking a sim card

[Swizz]

My sim card is on O2 and i want to use my sisters handset, but shes on Orange.

How do i 'unlock' the SIM and how much does it cost?

Someone said it is possible to do if for free, using an internet database or something..

Thanks!

[maviscoull]

its the phone you need to unlock, not the sim !

[maximo]

It's not the sim card you need to unlock, it's the phone! The handset is most probably locked to the Orange network. Almost any little phone accessories shops will do it for you for a fiver. If the phone is a nokia, I have found a website where you can do it yourself for free, I think it's called Nokiafree.com or something.

[THECORBYLOON]

There's a site here, http://www.unlockme.co.uk/dct4unlocking.html
I think that was the one I used on one of ma old 'phones.

[VaaMachi]

To get exact answer you need to specify the phone model . Anyway, Most of the GSM Phone can be unlocked using Unlock code . Some brands like Apple iPhones can be unlocked by remote unlock method . If you want to unlock your phone visit http://www.wickedunlock.com/supported-phones/rs11wp7/ . They provide unlock solutions for more than thousands of GSM phones. Also Check out the site http://www.unlocking4free.com/ they provide free unlock codes for some old GSM phones.