Posted by: iLLumination October 6, 2015
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Go to Iphone manual Page 6, second last paragraph
https://manuals.info.apple.com/MANUALS/1000/MA1597/en_US/iphone_4_important_product_information_guide.pdf
https://manuals.info.apple.com/MANUALS/1000/MA1597/en_US/iphone_4_important_product_information_guide.pdf