Yes, you can still use it, but then you will be charged casual data usage at $0.03 per kb, because it requires accessing the net to use that feature. Additionally, each message you send or receive will cost you $0.20.
You can add the Vision plan for $15 for unlimited data, but you will still be billed for each message sent or received. If you also want unlimited text, it could be as much as another $15, depending on which plan you are currently on.
Hope that helps!