Your sim card is possibly disabled because your phone is currently not activated or has not been used in over 3-6 months. You should go to your local service provider and have them check out the situation. You could just use a new one as the current sim card you have is ready to be replaced.
My sim card is disabled due to network error. I have tried to enable it by calling call center but nothing happened. I need a sim card which has better quality and least expensive. Hopefully I will be getting the same hereafter what I had expected in the other operators.