How can i open my mobile phone so i can use any sim of my choice for free?

i cant offord to pay this and was wantin to no if anyone cud help me out, i want to use my mobile but want to put any sim card in

Answers:
go down to your local market and ask the guy on the mobile phone stall if he can unlock it. normally costs between £5 and £10.
you can only do that if you have a GSM phone!
isn't it just right behind the battery?? And you can just put it in?
post on here the make and model of your phone and then i can help you further my sister in law got the disk and cable from ebay to do hers and it cost less than going down the market

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