iPhone 4S antenna issues a la iPhone 4?

i wondering if else has same issue or if it's phone. @ moment have 4s (5.0.1) running in tmobile gevey adapter , notice when hold phone covering bottom bridges, bars drop within seconds. happened when had on at&t , it's safe assume not gevey sim adapter.
use sim card bold 9900 , don't have same issues, full bars @ home , work; network not issue.

take genius bar force me 5.1 , besides don't think phone if it's jailbroken.

else have same issue?

 

nope don't have issue.

 

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