1. What does "4G" mean, anyway?
4G is a marketing term that service providers are using to describe the "fourth generation" of wireless services. Such services may use different underlying technologies, depending on the provider, but they typically offer between four and ten times the performance of "3G" networks.
2. What are the technologies behind 4G services?
The two main technologies are WiMax and Long Term Evolution (LTE). WiMax is a standard developed by the IEEE, the Institute of Electrical and Electronics Engineers; Development of the LTE standard is led by the 3GPP, an industry body for providers that use GSM, the current leading technology for cellular communications. Both WiMax and LTE use advanced antenna technology to improve reception and performance. However, the technologies rely on different types of wireless spectrum.
3. How fast is 4G compared to 3G?
WiMax providers today are offering contracts that advertise download speeds of between 2 megabits per second and 6 mbps, with peak speeds of 10 mbps and more. Verizon, which will launch LTE networks in the United States later this year, is expecting to offer services with download speeds in the 5 mbps to 12 mbps range. Most 3G data systems today deliver speeds of between 400 kilobits per second (that is, 0.4 mbps) and 1.5 mbps.
4. Why should I want 4G?
4G's faster download speeds and better overall data performance will significantly improve the performance of demanding applications such as streaming video, videoconferencing, and networked gaming. You may also be able to replace your home DSL or cable modem service with a 4G service that you can use both at home and on the road.
5. Are 4G services available now?
Yes, in some places. In the United States, the partnership of Clearwire and Sprint currently offers WiMax-based services in 28 cities--among them, Atlanta, Charlotte, Chicago, Dallas, Las Vegas, Philadelphia, Portland (Oregon), and Seattle. Clearwire and Sprint plan to add Los Angeles, New York, and San Francisco to this list in 2010.
On the LTE side, Verizon is the most aggressive of the U.S. providers, with plans to launch commercial services in 25 to 30 as-yet unnamed markets before the end of 2010; AT&T plans to follow with LTE in 2011. Internationally, WiMax services are already in use in many countries, including Japan, Korea, and Russia; and one commercial LTE network is running in Sweden.
6. What providers other than Verizon and AT&T plan to offer LTE in the United States?
In March, MetroPCS announced plans to launch LTE services in Las Vegas before the end of this year, using a dual-mode 3G/LTE phone made by Samsung. T-Mobile is expected to launch LTE services sometime in the future, but it has not specified a timeframe for deployment.
7. What are the cost advantages of 4G versus 3G?
Right now, the Clearwire/Sprint plans typically provide true "unlimited" data usage, whereas virtually all 3G cellular plans impose extra charges for downloading more than 5 gigabytes of data per month. Plans from Clearwire and its reseller partners (which include Comcast and Time-Warner Cable) are typically $10 to $20 per month cheaper than the standard $60 per month 3G cellular data plan, too. Verizon has not announced LTE pricing.
8. Can I get 4G on the 3G phone or USB modem that I have now?
No. The 4G networks are designed to run at different frequencies than the ones current cellular services use, so you'll need new radio chips tuned to the 4G frequencies.
9. Does 4G support voice calls?
Not in any current implementation, other than Voice over IP applications like Skype or Vonage. Most early 4G phones will be "hybrid" devices that include a 3G chip to handle voice calls.
10. Are any 4G phones available now?
As of April 2010, the only 4G phone announced for U.S. markets is Sprint's HTC EVO 4G, which was unveiled in March and is expected to be available by this summer. (Earlier, HTC shipped a WiMax phone for a network in Russia.) Verizon has said that it expects LTE phones to ship by mid-2011.
Source: PC World