Tencent android platform for users to chat at any time built a mobile instant messaging software QQ

Free messages, Free Calls. Unlimited!
Nimbuzz Messenger combines the power of internet and smart phone messenger into one, and lets you make cheap international voice calls, send unlimited chat messages, share files on any mobile device across popular messengers. Nimbuzz Messenger is available on Android, iOS, Blackberry, Symbian, Java, Windows and Mac.

Ignore your mother, talk to strangers.

Send and receive messages to and from random people who you don't know and who don't know you.