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On Call runs every two weeks, alternating between answering reader questions and discussing hot topics in the cell phone world.

It wasn't so long ago that the cell phone world was just transitioning to 3G technology. But now, just as we're getting settled, the ever-restless industry is moving on again. Fourth-generation technology, or 4G, is gaining traction and carriers are promising even faster data speeds.

So what is 4G? To start, think of wireless technology as a family that gets faster with each generation. Second-generation (2G) networks were faster than the original first-generation wireless technology; third-generation (3G) is faster than 2G; and 4G is faster than 3G. Speed is important for data transmission (not so much for voice) because a faster network lets you do more with your phone. The 3G networks that we use today allow us to stream video, download music tracks and other large files, and surf the Web on full HTML browsers. Think of it like moving from a dial-up Internet connection to cable or DSL--suddenly you could do more with your computer and do it faster.

That's why it's easiest to think of 4G not in terms of what it is, but rather in terms of what it can do. While 3G offers data speeds of about 1.5 to 2 megabits per second (Mbps), 4G will double that--and it could go even faster. It's important to remember, however, that promises are just that. As any iPhone user can tell you, 3G speeds can vary widely in everyday use, so 4G performance won't always be perfect.… Read more

Clearwire saw a huge uptick in 4G wireless subscribers in the fourth quarter, which helped the company narrow its losses.

The company, which is building a nationwide 4G wireless network, added 87,000 new subscribers in the fourth quarter, it reported Wednesday. This is up from the 5,000 it signed up in the fourth quarter of 2008. Clearwire ended the year with a total of 688,000 customers.

These subscribers also included wholesale customers, which use the Clearwire service through one of its partners, such as Sprint, Comcast, or Time Warner Cable. Clearwire said that its wholesale subscribers jumped … Read more

BARCELONA, Spain--Verizon Wireless is on track to offer its 4G wireless service later this year, the company's chief technology officer said here Monday.

Dick Lynch, an executive vice president and CTO for Verizon Communications, said during a press conference here that Verizon Wireless is on track to launch its commercial LTE (long-term evolution) service this year. The gathering was hosted by the GSM Association, which puts on the Mobile World Congress.

Lynch said Verizon Wireless is in the final testing phase, or "Phase 4," of its LTE technology. Within 60 days he said he expects testing to … Read more

Juniper Networks on Monday will launch three products for mobile network providers to get a bigger slice of the 3G, 4G, and LTE upgrade revenue pie.

The big picture: Juniper, which primarily competes with Alcatel-Lucent and Cisco Systems for wireless business, sees networks converging. According to Mallik Tatipamula, vice president of service provider marketing at Juniper, the mobile network will look a lot like the fixed line broadband infrastructure.

These so-called converged networks are growing in clout overseas and are likely to catch on in the U.S. in a few years.

Read more of "Juniper aims for larger piece of wireless network upgrade pie&… Read more

Japanese carrier NTT DoCoMo is set to demonstrate a prototype handset based on high-speed wireless data technology LTE later this month, according to its handset partner, NEC.

NEC said on Monday that NTT will demonstrate the handset receiving streaming high-resolution video across an LTE network at Mobile World Congress, which kicks off February 15 in Barcelona. According to NEC, the handset uses an LTE chipset that was developed by Fujitsu, NEC, NTT DoCoMo, and Panasonic, and first sampled in October.

LTE, the "long-term evolution" of 3G, is the successor to HSDPA and is roughly 10 times faster, providing … Read more

WiMax may be Clearwire's technology of choice today as it builds out its nationwide 4G wireless network, but the upstart carrier may eventually migrate to a competing technology that's expected to be used by most of the world's major wireless operators.

Clearwire's willingness to add additional 4G technologies to its network in the future will likely help it compete more aggressively in the future with other 4G wireless providers, such as Verizon Wireless. And ultimately this could mean more choices, better services, and more competitive pricing for wireless broadband services for consumers.

In an interview with … Read more

The world's first commercial LTE mobile broadband services went live in Oslo and Stockholm on Monday, through the Scandinavian operator TeliaSonera.

Offering theoretical maximum speeds of 100Mbps and real-world speeds of 20Mbp to 80Mbps, the services are about 10 times faster than predecessor HSDPA. As of Tuesday, people in Norway and Sweden will be able to buy a mobile dongle that supports the long-term evolution (LTE) of 3G. (TeliaSonera is calling its network "4G," but the official IEEE definition of that term cites 100Mbps as a minimum speed.)

"We are very proud to be the first … Read more

Mobile chip maker Qualcomm said Thursday that it has started providing new wireless chipsets that combine 3G and 4G wireless technology to help carriers transition to the next generation of wireless technology.

The company said Huawei Technologies, LG Electronics Novatel Wireless, Sierra Wireless, and ZTE are among the first mobile-device manufacturers to test the new chips.

Qualcomm said that devices that use the new chips could be available in commercial products starting in the second half of 2010.

The new chips will allow wireless phones and other portable devices to switch between a 4G wireless network using LTE, or long-term … Read more

Clearwire investors are pumping in another $1.5 billion into the venture to help pay for the company's nationwide 4G wireless network, according to The Wall Street Journal.

The article cites two unnamed sources "familiar with the matter," who said that Sprint Nextel, Comcast, Intel, Time Warner Cable, and Bright House Networks have all agreed to contribute an additional $500 million to the cause. Google, which had initially invested with these other companies, is not participating in this funding round, the article said.

Sprint and these other partners invested about $3.2 billion in Clearwire about 18 months ago … Read more