There are many apparent reasons and needs which are behind the introduction of the 4G. However as I see it one of the main reasons for its appearance in mobile phones such as the HTC EVO 4G for example is the dominance of the HD videos (online playback to be precise). While there are many other important reasons do exist. For instance operating systems or OS and applications are climbing up more and more in Gigabytes and for the user to download them online would take a long time using current network solutions (3G). In my opinion these are one of the main reasons.
As said earlier the popular HD related social activities not just movies and stuff but also VOIP, Mobile TV, etc services are also behind the seen and will also benefit in a greater manner with the introduction of 4G phones. The speeds are not measured in megabytes but it GB. The standards are laid out by the IMT organization which is responsible for setting up telecommunication standards. One main feature among these type networks are that they're not backward compatible. Or in other words you won't be able to use 4G phone (in the very near future - HTC already introduced one - see at the top) as a 2G or 3G device. Anyway as we move on to the future the more popular it will get and hopefully the latter or its predecessors will be wiped out.
Again this is merely a name and not just a single wireless-network solution, so we'll see more than one embedded wireless functions. Some well known companies such as Sprint Nextel (another cell phone giant - who's concentrated on giving calling plans) as far as in 2006 said that they've chosen WiMAX is going to be used in latest 4G phones.
They are hoping to achieve a minimum data exchange rate of 12 - 13 MB/s (note -not bit but Bytes) between two devices (anywhere globally). This is staggeringly fast in comparison even with today's standards. The Internet is growing at a fearsome rate and by the time of its introduction it should be fully compatible with IP6 protocol. So as a result more devices will be in constant touch with each other without having to slow down much thanks to their faster 4G phones or the any unit that has it.
Another thing to remember is that this new arrival on the G family will suck some power out of the battery at a rate higher than its ancestors. So to keep up and give the end user a reasonable amount live time through the cell phone battery there should be some powerful units too. This could be one of the shortcomings of it but hopefully lats assume that the engineers involved in bringing this to life will be able to get around this so "we" don't have to empty our pocket when buying 4G phones!.
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