Iphone 4s without cellular connection?

Just because my ipod touch is really slow, and i don't want to pay for cellular connection, is it possible to get an iphone 4s off ebay or something, and disable the cellular connection and never pay and use it as a Wi-Fi only device?

I think its possible, but thats really unwise. You can't use the full capability of your device. Since, its the main function of cellphone. Your just buying iphone 4s while using 50 percent of what it can do.
I think you'd better buy ipad or mac air if you want.