I Lost all my contact and data

i have problem with my iphone4, it was ios 4.3.3 then i update into 5.1.1. before i doing upgrade i have backup all my data into pc via itunes but not succesed, then i do for upgrade because ithink all my contact not lost after do upgrade ios. but now, all my contact lost. can you help me how to recover my contact data ? i'ts looks like if data in pc lost we can recovered using tools. but how if iphone? please help me
best regards.

any tools for recover iphone data? please give me information, coz i lost all my contact data and thats very important to me.
best regards

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