Internet not working on my iPhone 4?

I have had my iPhone 4 for about 2 months now, and every time I want to access App Store or Safari it says 'Could Not Activate Data Network' My internet on my phone only works in certain areas of my house, so I get my WhatsApp messages when I get home which is not really useful.
I've reset my Network Settings but it didn't really make a difference. Any other ideas?

Should've bought an Android.

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