I have my att sim card from my old phone and want to switch to an old t-mobile

The phone is prob locked to worth with t-t mobile sims Only

James F said:

sidekick i says needs sim code? It keeps asking for a special code but i dont no wat it is talking about i tried my puk code but it says type special code to enable sim where do i find this code

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I guess you mobile locked to previous network provider.without unlocking you can't switch your sim card.You can unlock your locked mobile phone using an unlock code.If you need an unlock code visit Unlocking4u.com Here you can get your unlock code through e-mail.So you can easily unlock your mobile from home at affordable cost.Recently i unlocked my mobile here.I hope it will be helpful for you.