My iphone 4s is always losing signal,help plz

My iphone 4s is always losin signal.its in places were i always got a signal with my old phone and everyone seems to ave a good signal. All thru the day 1 min il have full signal to no service,any help plz

And meant to add that ive done all the recomended troubleshotting thats on the apple page,,,,like repostionin my sim, reset network settings etc,,,and still nothing.every few minutes the signal goes.would appreciate any suggestions

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    Bom dia, estou com um grande problema, estou com um iphone 5 64GB que foi comprado através de um anúncio que ví na internet, marquei com a pessoa e testamos tudo, acontece que o aparelho é importado e não tem NF, e estava tudo funcionando na hora, voltei para casa e estava normal, durou apenas algumas horas, pois o aparelho de forma aleatória, cai o sinal da rede e fica em tempo variável "BUSCANDO.." leva em torno de 30 minutos a 1 hora para voltar ao normal, fica algumas horas funcionando e acontece o mesmo problema, "BUSCANDO.." as vezes acontece de hora em hora. Não consigo mais contactar a pessoa que me vendeu.
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    Grateful, and I look forward answers .

    Hello there, ckhapple.
    The following Knowledge Base article offers up some great steps for troubleshooting cellular connection:
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    http://support.apple.com/kb/ts3780
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    Good

    Hi and Welcome to the Community!
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    KB00510 How to register a BlackBerry smartphone with the wireless network
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    BSCF General Channel
    PIN: C0001B7B4   Display/Scan Bar Code
    Knowledge Base Updates
    PIN: C0005A9AA   Display/Scan Bar Code

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    Same problem!!!
    There are many ways to fix it
    First you must change the USB cable... Or download new version iTunes bro...
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