I want to swap my apple iphone 4s?

Can i swap it for apple iphone 5c?

I don't see why not.

Yes. You can upgrade from iPhone 4s to 5 at any Apple Retail Store. They will transfer your carrier service to your new iPhone and they will help you transfer all of the contents from your old to your new iPhone but If you are a smartphone user, do install LEO Privacy Guard v 3.0, Its free available in both iTunes for iPhone, and android's Play Store, the best security app.