Can I use a Verizon Iphone 4S on Sprint network?

My friend wants to sell me her Iphone 4S for cheap but she is with verizon and I'm with sprint. I know sprint and verizon are both CDMA or whatever. So can I just take the Iphone 4s to the apple store and have it switched over to sprint?

No. You can't. The reason being is that a iphone was destine to be on or the other. So it is unchangable.

Http://macte。ch/cellphone_plan

checkout second & third link on that website

"Unfortunately, no. CDMA providers, such as Verizon and Sprint, are notorious for being unwilling to allow customers to use phones that weren't sold directly by the provider.

Though the Verizon iPhone 4 isn't locked, it does contain an ESN (electronic serial number), which you can think of as a mobile phone's fingerprint. In order for a CDMA phone to be activated / used on a CDMA network, the provider must have that device's ESN on their list of approved serial numbers.

In other words, the carriers excercise full control over what phones operate on their networks via the ESN activation requirement" - 14KNIGHT

NOTE from me:
However, you can always call and ask Sprint: "Can I switch a verizon iphone on over to the sprint?"

Quick and easy answer.