What is your phone brand?It is Nokia 100 ?If the phone displays invalid sim message on the screen.It is locked to network.You need to unlock it.To unlock your Nokia 100 use unlock code.Visit the site Wickedunlock.com get unlock code and unlock it easily.Then use with any GSM network sim card.Check code is available for your network and country.If it is available get it and unlock it easily.Then use any GSM network sim card.It will not display invalid sim message on the screen after unlock it.
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