Oasis cellular mobile operator is a not a good mobile operator to be used by anyone. It has got nothing in it. I purchased it and they activated my card after 3 days. Its network is really very poor. Its hard to do any task because of its popr network. Their customer service is very terrible. They dont resolve your any problem. They deducted my money without giving me a valid reason. There charges and billings are very high as compared to other mobile operators in the markets. They cost you almost double.