You need a sim card to activate your iphone, but you don't need one to use it unless you want to, you know, make a call. I assume Android is similar. Take the sim card out and pass it on to the next device once you've got the phone set up, and it's identical to using an ipod touch.
Although for clickfarming, most likely you're wanting to use the cheapest devices you can buy, so an ipod touch would be the preferred IOS device, or a really cheap $100 AOSP tablet for Android. The woman in the picture appears to be using a rack of tablet sized devices.