My Sprint Iphone 4s only has One Signal Bar?

I'm new to iPhones lol… And sometimes my iphone only has One Signal Bar and it says 3G.
is there any thing i can do to help the signal strength and get more bars any Tips? I saw where you can reset network settings or reset all settings i'm scared 2 do either because i don't know what it will do 2 my phone. Any tips People?

Get verizon

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