Updating my iphone to ios 4.2?

JennyK

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so i'm basically ready to update my iphone but i have a question.
last time when i updated my dad's iphone to 4.0 it deleted all his contacts...
i think there was an error during the middle of it but i forgot.. maybe that's why it deleted all his contacts..
but i'm scared that if i do it to mine it's gonna delete all my contacts. i know i can write it all down b4 updating it but that's too much work.
is there any way to sync my contacts to my computer or when you update your phone does it not delete ur contacts? did my dad's contacts only erase cauz there was an error thingy in the middle?
 
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