Does the iPhone on Straight Talk use Verizon or Sprint towers?

[Zarin]

I wanted to know if the iPhone 4S/5 on Straight Talk uses Verizon or Sprint towers. Verizon is really good in my area, and I was thinking about getting the iPhone with them... but the cost is a little too much. Sprint in our area is pretty spotty so I wanted to see what carrier the Straight Talk iPhone has. I saw on Straight Talks website that it is CDMA and to NOT use a sim card.

Thanks

 

[Jason]

ST uses multiple networks, Verizon, Sprint, T-Mobile and AT&T(recently stopped selling AT&T SIM) depending on the phone. From what I've known ST's iPhone runs on Verizon network. Contact their CS to be sure.