unable to install whatsapp in iphone 4s

I

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i downloaded whatsapp from itunes store and while trying to load in my iphone 4s it is not installing. i tried to drag it on to iphone but it is showing will install
 

phreddyl

Well-known member
Feb 12, 2011
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Does it show installing on your phone? If so I would delete it and try to install again. Do you have a good signal?