restauring iphone

i just bought a iphone with the firmware 4.3

i need to downgrade it to 4.2 but my only concern is if i do this downgrade

what will append with my phone provider.

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IT_AEConnect With a Mentor Commented:
You can do it, but the thing is how you will do it? , the provider never will know because you are changing the OS, thats it. After you do this , you have to activate the phone with the itunes, if you have the original provider chip inside, you phone will be activated without problem
So long as you do not mess up the phone while downgrading, the provider will not be involved...

If there is a problem with the phone as a result of the downgrading, the warranty might not be available to help you with problems.
There should be no problem doing this. Worst case you can always just plug it into iTunes and upgrade it again.

Just out of interest, why do you want to downgrade?
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