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Up to date, we are not cornered to know about this word 'network' completely in our "smart phone". But in future, it is necessary to peoples who are frequently using flights and mobile. Means, who are going to travel frequently to many countries,
What is network connectivity? Our mobile phones or smartphones can able to working under some frequencies only. Which can be able to support or matching with its frequency. Every country has some different range of frequencies for its radio devices. To undergo this, four types of bands are come in to force.
Single band: some basic phones are comes with this single band only. They can be operated with this frequency only.
Dual band: this is two band frequency ranges. Both these two are comes below 850MHz.
Tri band: Phone, which has this technology, can be used in frequencies like 850MHz, 900MHz and 1800MHz or 1900MHz. so it can be used in any of these three bands.
Quad band: this is a four band frequency range. Those are 850MHz, 900MHz, 1800 MHz and 1900MHz. now day's smart phones only have this technology. They can be operated under these frequency ranges. Almost it covers entire frequencies in all over the world. If any one has quad band "smart phone", then no need to worry about network connectivity.

Most of the countries in Asia and Africa come under the range of 1800MHz. Some examples of frequency Frequency range 850 MHz - entire US, Canada and Brazil Frequency range 900 MHz - Asia [except Japan and S.korea], Africa, Australia, Europe Frequency range 1800 MHz - Asia, Africa, Australia, Europe, Brazil Frequency range 1900 MHz - US, Canada, Brazil
From the above table we can able to know the importance about range of frequencies and importance on network connectivity in our Smart Phone.

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