Can I buy more space for my iPhone 4 for my pictures?

My friend has like 3, 000 photos on her iPhone 4s, and on my iPhone 4, after i take like 1, 100 photos it won't let me take any more since i don't have enough space. How can i get more space to take more pictures and videos? Oh, but i always upload the photos on my mac on iPhoto, but i like to keep most of them

You can't buy more space for your iPhone.
If you want to get more space for photos and videos, you can delete some of your apps or songs or other stuff which takes up space and you don't need. If you really need more space, you can buy a another iPhone with a bigger storage space.

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