Can I use a Sprint iPhone with Verizon?

My friend wants to sell me his iPhone 5, but his carrier is Sprint. I'm on Verizon.

Is there any way to change carriers on the iPhone 5 from sprint to verizon?

How do you unlock a AT&T GALAZY3 Samsung cell phone when you forgot pattern and or code

Same CDMA signal, but answer is still NO. Sprint doesn't unlock their phones for use on another domestic carrier. Won't until Feb. 2015. SIM doesn't matter. No unlock, no can use. Best luck.

Both Verizon and Sprint phones use the old CDMA system, which requires that the identifier for the phone itself be registered with the network in order to use it. There's no SIM card, although many phones also allow for use on GSM networks with a SIM card. That won't help for use on the home networks of Sprint or Verizon, though.