mine is the same way i think samsung has week radios in them plus the new update lg8 hasnt help any plus i can be next to my wifi and only have one bar when my dads iphone has full bars so i think samsung g3 isnt all that awesome
I'm in my house with one bar. My evo always had 2 or 3 and my wife's I phone on sprint had more bars.
It is not meaningful to compare "bars" across two different phone designs. "Bars" are arbitrary units with no standardized scientific definition. So different OEMs map different increments of received signal strength, commonly measured as dBm, to different numbers of "bars." We might as well call them unicorns.
A small minority come on here talking about laggy S3's. There's some things you can do for that.
Look for tips and tricks thread, and change some needless settings.
Or, bring it back to sprint, show them that it's laggy, and see if they will swap it.
Unlike a lot of other people, I've never had a problem with Sprint's customer service.
Just don't walk in the store with the attitude like these people purposely sold you a crappy phone.