Has anyone use skype with a phone or mobile game device?

I'm thinking of trying skype on my wife's Nokia Lumia 925, but their page isn't clear to me. Can anyone clarify this?

1. So if my wife downloads this for her Nokia 925 phone, and I'm home on my PC - a Lenovo ideapad z510, windows 8 - she
can send me a 'message' (not a call) for free?

2. Could her phone call my pc for free, or if not, what's the charge for that?

2. Could I use skype on something like a 3DS to send a message to her phone for free?

As long as the Skype "call" goes through the Internet and not phone lines it should be "free". As soon as a phone number is involved it costs. That is my understanding.

So, yes, she could call you for free from her phone using a Skype call to your Skype account on your PC.

1. Yes, it works just like any other instant messenger
2. Yes, call between skype user is free, if she call a phone number she needs to top up skype credits
3. Yes, as long skype can be installed to the system (Nintedo 3DS)