If I have an iPhone 4s can i upgrade to a 5s?

I have insurance on my iPhone 4s & it is slowly breaking, so if I take it in to get a new one, will I have to get an iPhone 4s because that's the one I had before, or will they let me upgrade to a 5 or 5s? & if they will, will it be free? (my carrier is Verizon) thank you.

Wait for iPhone 6 next month.

Usually you will have to pay around 100-150 to get a brand new phone with the upgrade compared to 500-700 dollars without the upgrade
And you get an upgrade every two years, so ask yourself how long you had the phone.
But seriously agree with Jared, wait for the iPhone six

They'll give you another iPhone 4S.