Tell her on your phone, you can be on jabber, yahoo IM, AIM, Skype and Facebook all that *at the same time*. If WhatApp can't cross connect to even ONE other service, then it's the limiter, not your phone.

Sorry, but some apps are very device specific and very closed. If you wanted to use AIM for the first 3 years it was running, it was available for Windows only. I don't see that as Windows being great or other OSes being inferior. I see that as a very lazy developer who wrote an app for one device and didn't feel like porting it.

If you're that concerned about it, setup an OpenFire XMPP server and configure her phone and yours to chat via that. Of download an app for her device that can chat on another free service. Oh, wait... her app would be suspended because she's running Android, so she can't really have two IM apps running at the same time like the N900 can...

Sucks...