What are the advantages and disadvantages of VoIP over traditional telephony?

The most important thing is that it is cheap, especially for long-distance and international calls;

For example, if you use the VoIP phone 4gtong, it is the same price across the country, almost 3 cents a minute; a normal phone call will cost about 30 cents;

Disadvantages:

Many users have responded to the fact that the quality of the VoIP phone calls may not be as stable as the traditional phone calls, but now there are some VoIP software that does a good job. Not very stable, no traditional phone good, but now there are some network phone software to do still good, love call, 4g pass these sound quality stability.