Can my iPhone 4S be used as an iPod without phone services?

As in I stop the phone plan and just use the features that don't include phone, text, or Siri just wi-fi relied?

Added (1). I thought features were locked if you didn't have a sim card?

Yes you can stop the plan. But it costs like $700 unactivated unless you already have it

I think the best you can do i turn off your mobile data through your settings.