Things learnt today:

1.Chrome browser is having to HTML5 support.
2.what is USB modem stack?
    USB modem client is installed in mobile/device. USB Host driver is installed in laptop or system.
with the help of USB modem stack we can take mobile's internet connection to laptop or system.
In android, this is called tethering.

3.Wifi Hotspot in android mobiles:
    Android mobiles are having Wifi hotspot support. if mobile has internet connectivity, our mobile will acts like WiFi router . we can connect device or laptop
to that WiFi hotspot.
   To provide support WiFi hotspot, WiFi chip should be available in android /mobile device.
Accessing internet via Wifi hotspot is also called as WiFi tethering.

4.VoIP phone:
A VoIP phone uses voice over IP (VoIP) technologies allowing telephone calls to be made over an IP network such as the Internet instead of the ordinary PSTN system. Calls can traverse the Internet, or a private IP network such as that of a company. The phones use control protocols such as Session Initiation Protocol (SIP), Skinny Client Control Protocol (SCCP) or one of various proprietary protocols such as that used by Skype.
From : http://en.wikipedia.org/wiki/VoIP_phone