Iphone zoom feature only partially activates?

Nigel

New member
My iphone 3GS has worked fine until the past day or two, when the zoom feature on it, activated or deactivated by a three finger tap, has gone wrong - now the zoom only increases the size of the image by about 5% which is a bit useless - i ahve tried formatting and reauthorising my phone - but nothing seems to work - can anyone help me please?
 
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