General please help me urgently

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http://androidforums.com – hi there My S3 was full of credit a week ago and in this whole week I didn't make calls or send messages even the mobile data was off , I didn't connect to the internet with any possible way for this whole week , and today I wanted to make a call but it tolds me that there's no enough credit to make a call or send a message or even connect to the internet via mobile data , can I know if it's the device's problem or what ?? I started to hate it :(:( I hope you can understand my problem :( (General)