Support New phone activated, not connecting to internet?

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http://androidforums.com – Hi there. I am new to this site and to Android in general. I'm hoping someone can help me as I am not technologically savvy whatsoever. I just received the Samsung Galaxy S3 (Sprint) and I just activated it. However, I am on the home screen and it will not sign in to Gmail, nor is it able to find my location when I tried to add that. I think it's having a problem connecting to the internet, and I have no idea what to do. I plan to call Sprint customer service once they're open, but for now I thought I'd try this. Any ideas? Thanks in advance! (General)