Can I put my att razor sim card into my new blackberry?

Soccerfreak said:

HELP!
It is my brother's Blackberry. He said I could use it, but its not working when I swap. Any suggestions?

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I guess your blackberry phone is locked to previous network provider.
So only you faced problem after swapping your own sim card.Better try to unlock your blackberry phone before put your own sim card.You can unlock your mobile phone using network unlock code.It's one of the best way to unlock your mobile phone.If you need an unlock code visit Mobileunlocksolutions.com Here you can unlock your phone at low cost.Once unlock your mobile you will be able to swap your sim card when you need.I hope it will be very useful to you.