4G error in 5.1 ?

wirelessly posted (mozilla/5.0 (iphone; cpu iphone os 5_1 mac os x) applewebkit/534.46 (khtml, gecko) version/5.1 mobile/9b179 safari/7534.48.3)

using iphone 4s when noticed header bar said 4g instead of 3g. switched wifi shortly after. snapped screen capture can't post images here. though interesting , wondered if else had noticed happen on phone or might mean.

 

it part of 5.1 update came out wednesday

 

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