Hi everyone,I have an Iphone 4S,when I updated iOS 7 my phone got slow,so please help me how to downgrade it to 6.1.3 or 6.1.3,I have another problem with iOS 7,I cant request my credit balancing,when i type *101

Hi everyone,I have an Iphone 4S,when I updated iOS 7 my phone got slow,so please help me how to downgrade it to 6.1.3 or 6.1.3,I have another problem with iOS 7,I cant request my credit balancing,when i type *101# automatically calls and says "this number dows not excits",I wnat iOS 6.1.2 back ..

sorry for my bad english ..

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