ONE BAR SIGNAL OR SEARCHING ON MY IPHONE 3GS IOS 4.1 AFTER AIRPLANE MODE?

ACTUALLY my iphone 3gs is unlocked but sometimes shows no service, searching and now after i did the airplane mode trick it shows one bar signal… I have turned crazy gooogling over the net to find solution but every thing i did just sucks… An easy and fast solution will be highly appreciable!

One easy step to do:
cycling airplane mode on and off repetitively and in a fast way may bring back the signal to normal

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