How to remove t-mobile software from Nokia 5130

Hello, My phone is unlocked already, but t-mobile' software still exist in my phone.
How to remove this, because it make a problem with my phone that is always appear message "SIM Card registration failed" then i can't use my phone book.
Thank you
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More about remove mobile software nokia 5130
  1. Speak to your cellphone provider, if the 5130 is a model they support there may be an update they can download.
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