What is the "SIM Toolkit" found on the HTC One V?

is not ready or unsupported.

SIM Toolkit isn't ready or unsupported.thanks

My mobile HTC welfare510 net problum sim toolket but this

The SIM toolkit has additional information and functionality that has been pre-programmed on to the SIM card to provide customized menu/user interface on the device. Through this, users can directly access value-added services provided by service providers and network operators, such as banks and entertainment organizations. If the SIM toolkit isn't working you should contact your provider for assistance.

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