Can I use an Iphone 4s without sim card?

I'm planning to buy an Iphone 4s, but not interested in buying a plan, a sim card etc.
I already have an old fashioned motorola cell phone, that is more than enough for me.
I want an Iphone to use is just for the camera (takes better pics than an Ipod), and accessing internet.
before I had an Ipod, at home we have internet and I were able to access internet with that Ipod, will I be able with the Iphone 4s too?
I never bought one before so don't know much.
thanks

Added (1). Rachel: what happens if I buy an used Iphone with contract but then let it expire? Is it still ok?
our regular cell phone is working by just adding minutes when we need it, so not expert about contract phones.

Iphone with no service = Ipod Touch… LMFAO

Yes, you will be able to connect to your Wi-Fi and use internet.

IPod touch 5 camera is better and I believe it's cheaper it cost like 300 dollars, but yes you can use it but I do recommend the iPod touch 5

So what I gathered here is you just want the iPhone 4S for the camera and to use wireless (Wi-Fi) internet. The good news is YES YOU CAN use just Wi-Fi for internet and you DO NOT need to get a SIM card or a plan.

However, you'll need to drop $599 for it unlocked. If you want a SIM and a plan, it will cost you $99 with a 2 or 3 year contract. If you're looking to save coin, I'd recommend the unlocked one. Because when you calculate the monthly plan in the long run it'll be well over $2000.