Replacement iPhone 4S Has Weaker Wifi & Reception

hey everyone

got iphone replaced @ genius bar , next day using @ home , school, noticed reception bars , wifi bars not "high" are.

compared 4s dad's... left them both in same place , periodically checked on them , noticed had 1 bar less him - both on wifi , reception. both using same carrier.

has never been problem me on previous phone had full wifi signal , full reception @ home...

tried resetting network settings , doing hard reset , restoring phone, seems wifi , reception still not dads.

ideas? should bring phone genius bar?

in advance!

 

i'd compare phones in test mode @ least cell reception. yeah trip apple maybe in order. 4s gets wifi reception , amazing cell reception.

 

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