Misconception about 3G

There is some understanding that one of the 3G in the general public.

3G services can not be without any coverage of the 3G service operator. Just buy a 3G handset, it does not mean that 3G services can be enjoyed. Handset can automatically switch to a 3G network when you, the customer does not receive 3G coverage. So when someone is being moved and use the video call service, and then forced to switch to the 2G network, the video call service will drop out.
3G services are at a frequency of 1900 Mhz. ITU-T defines the 3G services for GSM in the 1900 Mhz frequency band with a width of 60 Mhz. However, in general, based on CDMA2000 technology uses spectrum in the 800 Mhz frequency, or commonly known as the spectrum PCS (Personal Communication System).