With the help of C2DM push notification in andriod user can send messages as a broadcast to other android device. It needs no operator services. It needs only Internet services. This is same as the push notification in android if you want any information or any code regarding this then please mail me at onlineandroiddeveloper@gmail.com.
In android push notification can be done by 2 ways first by C2DM(Google) and second one is by third party(Tokudu). for this we want PHP code also.
