You may try out our XMPP server. You may create conference rooms/ chat groups, use the service from mobile device or pc/mac. Get the Spark client here http://www.igniterealtime.org/downloads/index.jsp install the version for windows, linux or mac.
Follow the instruction of creating a new account using the server address aperta.epicdot.com default port. Client can create the new username to your choosing.
Note: Browser must support flash! You can also create an account visiting www.epicdot.com/im on the right click create account. After creation, you may use the web interface or continue using a client.
You can now use the userid you just created on Android/IOS device.
Android and IOS devices can use an XMPP compatible program available for free. There are several versions, some more stable than others!