Wi-Fi, which is a trademark of the Wi-Fi Alliance, is short for wireless fidelity.

A device with Wi-Fi can wirelessly connect to the Internet when it's range of a wireless router that is hardwired to the Web.

While Wi-Fi can be used with many devices, how is the short-range technology specifically useful for mobile phones? What are some issues with Wi-Fi? Learn all about Wi-Fi here!

If you want a budget cell phone with today's basic needs that doubles as a music phone, the Nokia 5130 XpressMusic might be for you.

This candy bar phone was released after the Nokia 5310 XpressMusic and the higher-priced Nokia 5610 XpressMusic.

The key improvement with the 5130 for T-Mobile is its six-hour battery life with up to 12 days of standby time when not in use at all. If you're looking for a major upgrade in the XpressMusic handset line, though, you might be disappointed.

Is the 5130 a fit for you? Learn all about the Nokia 5130 XpressMusic here! You can also learn more about other Nokia phones and read about more budget T-Mobile phones, too.

New measurements were published on Jan. 28, 2010 from the nation's first in-depth study of the performance of leading mobile Web sites during the 2009 holiday shopping season.

The results left much to be desired.

Keynote Competitive Research, which is the industry analysis group of Keynote Systems, measured the performance of 10 retail mobile Web sites during the busy holiday weeks of Nov. 18, 2009 to Jan. 4, 2010.

The 10 sites were Amazon.com, Barnes & Noble, Best Buy, Costco, Dell, Foot Locker, Musician's Friend, Sears, Target and Wal-Mart.

The study measured the download performance for three pages on each site: loading the mobile site's home page, searching for a product and retrieving information about a specific product.

Measurements for the Keynote study were taken from New York and San Francisco using data connections on the AT&T;, Sprint, T-Mobile and Verizon Wireless cell phone networks.

Average load times for mobile home pages ranged from 8.3 seconds in the best case with Best Buy to 34.4 seconds in the worst case. Search results ranged from 4.5 seconds for Wal-Mart to 37.9 seconds. Product information ranged from 5.7 seconds with Foot Locker to 26.8 seconds.

"Wired Web [users] are used to much ... faster times and often expect pages to load in two seconds or less," said Ben Rushlo, senior manager of Web technologies at Keynote, in a statement.

He added: "Even the best mobile Web sites take two to three times as long as that despite being optimized heavily for ... mobile [phones]. The worst sites are taking [more than] half a minute on average to load each page."

The study also showed that mobile sites have much higher error rates than non-mobile sites. The overall range of availability was between 97.6 percent for Foot Locker to just 74.7 percent. Keynote says that consumers on the wired Web expect 99.5 percent or better availability.

As such, even the very best mobile Web sites are not fully meeting consumer expectations. Only two mobile Web sites in the study achieved an overall availability better than 90 percent and three Web sites were below 80 percent overall. More cell phone studies can be found here.

While AT&T; and Verizon Wireless recently lowered the price of their unlimited plans to $69.98 and $69.99 per month respectively, that's just for voice minutes.

What about text messaging and data? Once you add in unlimited texting and data, the new unlimited AT&T; and Verizon Wireless plans jump up to $119.98 and $119.99 respectively.

Instead, how does $79.99 sound for unlimited talk, data and texting? Though perhaps you've never heard of the company, Cellular South hopes its offering sounds mighty attractive.

Cellular South announced last fall this nationwide Smartphone Unlimited Plan for individuals and families with smartphones. You can even add a second line for only $39.99 more.

Combined, that means you could get two fully unlimited lines with Cellular South for the same price as one line with AT&T; or Verizon Wireless.

But what's the catch? There's a big one. While its primary talk plans require a two-year contract just like the main plans at AT&T; and Verizon Wireless do, Cellular South is only a regional carrier. The carrier's major issue is its very limited coverage.

Customers participating in Cellular South plans must reside in select southern U.S. cities. If you don't (i.e. if you live in Chicago, San Diego or New York City), you can't use the service.

Specifically, Cellular South customers must live in Mississippi; generally in and surrounding Memphis; Arkansas; west Tennessee; Mobile and Baldwin counties in Alabama; or Escambia, Santa Rosa, Okaloosa and Walton counties in Florida.

If you're in one of these areas, you can then call nationwide. The carrier has a 50/50 rule that says at least half of your calls must originate from one of these areas. If you travel outside of such an area, your roaming is covered so long as it's for less than half of your usage.

Along with a few others, Cellular South does offer one of the industry's heavy-hitting smartphones: Google's Android-powered HTC Hero.

Other companies (and especially prepaid wireless carriers) offer lower-priced alternatives to the unlimited plans at AT&T;, Verizon Wireless, Sprint and T-Mobile with better nationwide coverage. Learn more about Cellular South's unlimited pricing in this full-size cost matrix.