Call failing in iphone 4s with ios 5.1

Call failing on iphone 4/4s with ios 5.1 from different locations and with different sim cards, whereas same sim cards when installed in other mobile like nokia e52,no call dropped ????????
Any thoughts on this ? I Got 3 bars and boom ! Call failed.. and speaker option also intermitant :((((((
Replace iphone 4s in warranty, reinstall complete window and itune and restore mobile, but problem same  ..
in my oponion its IOS 5.1 issue and what you say .... Tireddddd alot

Do a reset (Hold Sleep/Wake and Home buttons about 10 secs or more till Apple logo appears)
Note: you won't lose anything.

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    ciao
    io ho RISOLTO!
    allora ecco come ho fatto:
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    auguri di buon anno
    flavio
    ah se vuoi mi trovi su twitter @yales70 o facebook flavio da ros
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