Can I upgrade my iPhone 5 to 5s?

I have an iPhone 5 and I got it this year, but I was wondering if I could upgrade it to 5s because my contract hasn't run out yet. I'm also wondering should I even upgrade and is the 5s even worth it.

It depends on your carrier. Ask them, if it's possible then upgrade to 5s

Depend on your cell phone carrier, but you have to pay for this otherwise software you can't update your phone

Pay 2year contracts will prohibit it unless your line isn't under a contract or you don't get the 5s at the discounted rate from Verizon. That agreement is what blocks you out of the promotional upgrade options with the provider. See if they will allow you to do what's called an early edge program if on Verizon.