4g connectivity

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http://androidforums.com – I wanted to ask if anyone who knows for a fact that they are in a VM/Sprint 4g area is having problems connecting to 4g. I live in Tampa,FL which is confirmed to have strong full 4g coverage by both Virgin mobile and Sprint networks. My S3 shows the 4g symbol in the status bar but I cannot connect to any network other than 3g and any internet apps or activities say that I'm not connected. All other services work such as SMS, MMS, calling and 3g. But 4g is broke:( Does anyone know the root of the problem or a possible fix? (I am completely stock And without root) (General)