cellular networks

Getting a text message is akin to someone sliding a piece of mail under your door: You may not have asked for it, you can't stop its delivery and you have to deal with it whether you want to or not.

The fact that text messages appear on mobile phones without any interaction from the user, and sometimes with limited interference from the cellular network operators, can give criminals an opening to break into those devices, as three teams of researchers showed Thursday at the Black Hat security conference [in Las Vegas].

Their targets ran the gamut.

Research In Motion on Wednesday launched the much-anticipated BlackBerry App World, an on-device application store for BlackBerry smartphones. RIM is hoping its platform will see the success that Apple has enjoyed with its App Store, with about 800 million applications downloaded since last summer.

BlackBerry App World is available to BlackBerry smartphone users in the United States, United Kingdom and Canada. RIM said it's planning more country launches, but didn't offer a time frame. The BlackBerry store offers a blend of personal and business applications, both free and paid.

From what Verizon has said this week about its plans to build out a new wireless network based on Long-Term Evolution (LTE) technology, its 4G technology appears to be on a collision course with the WiMAX technology pushed by Clearwire and Sprint.

Comcast Corp. said Tuesday that its investment in a joint venture to offer mobile Internet access to subscribers could be finalized by the end of the year.

Steve Burke, president of Philadelphia-based Comcast, said the new service would let cable companies offer "wireless data speeds that Verizon and AT&T can't match."

Comcast, the nation's largest cable TV operator, in May joined Time Warner Cable Inc., Intel Corp., Google Inc., Sprint Nextel Corp., Clearwire Corp. and other partners to form a $14.55 billion communications company that will offer high-speed mobile Internet access.

To counter recent blog reports predicting that its Xperia 1 smartphone would miss this year's holiday shopping season, Sony Ericsson told media outlets this week that its first-ever Windows Mobile device will be released in the fourth quarter of 2008.

The new multimedia handset, which will feature a three-inch color display, slide-out Qwerty keyboard, Wi-Fi radio and GPS-based navigation, will be available for use on selected high-speed (HSDPA/HSUPA) cellular networks worldwide before the end of this year, the company said.

A new application enabling Apple's iPhone to share EDGE or 3G Internet connections with other wireless devices briefly appeared in Apple's App Store, only to be pulled minutes later.

The Netshare app by Nullriver is based on SOCKS -- an Internet protocol that enables client-server applications to transparently employ the services of a network firewall. Netshare essentially converts any iPhone into a portable Wi-Fi hotspot, with all Wi-Fi-enabled devices able to share a broadband Internet connection wherever a cellular signal is available.