iphone 3gs network/setting help plz

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Joined
14 Jul 2010
Posts
210
hi all right i have got my self a 2nd hand iphone 3gs it was on 02 monthly, i have got it unlocked through 02.

Now i have put my tesco pay and go sim card in but it seems to keep dropping the network all the time and failing calls am i missing some manual settings or some thing

any help would be great thanks
 
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