My friend is in china and she is using android phone. Now I use ubuntu.And in there facebook is blocked.And, kik,wechat doesn't work in pc laptop. I don't have an android. so Is there any chat messenger which can work in both her android in china and I can use in ubuntu? I am seeing pidgin for android.. but it's not free.
SnapOverflow
You don't have to share the same client, just the same protocol. You can use the XMPP protocol (AKA Jabber). There are many free providers, you can see some here. Google used to use this protocol back when the messaging application was called Talk, but now it doesn't; so mind that. (You can revert to old protocol in Google AFAIK, but you should confirm that.)
Skype has a chat/instant message feature. The Skype app is available for Android in Google Play Store (Android apps), and it also can be installed from the default Ubuntu repositories.