IPhone4 operating very slowly

I've noticed that my iPhone4 is increasingly running slower and slower. I first noticed this with the camera which when the app was opened would take a good 5-7 seconds before the 'shutter' opened. Now all of the phone is affected, such that the phone is not immediately responsive to my touch commands (ie. when entering the Security PIN it lags, and it there is a delay when opening all apps).
I've checked and there is plenty of space (some 19Gb) left on the phone, and I have updated it with the latest software and carrier settings.
Any ideas?
Thanks

I said nor meant to insinuate any such thing.
My response was directed at this question.
I'm guessing I should power on/off on a fairly regular basis then?
For those that leave their iPhone on 24/7, what I provided applies, but there is no harm caused by powering your iPhone off every night if you prefer doing so.
I leave my iPhone on 24/7 since I don't have a landline which I have connected to a power source at night so the battery is fully charged in the morning to begin my day.

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