Why does my iPhone 4S keep on saying 'storage almost full' all the time?

I got my iPhone 4S about 2 months ago and I have deleted loads of apps, pictures and all the messages I've sent off it but it keeps saying my storage is almost full, why is it doing this I need help please

Go into the settings, then go on general, and then about and it will tell you how much free space you have. Pictures and videos take up a lot of space and some apps take up more space then others. But mostly its videos. If you have any put them on your computer or something.

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