Google Inc. is shifting its strategy for its Android mobile operating system, in a bid to create a united front with smartphone and tablet makers to take on rivals like Apple Inc. and prevent wireless carriers from controlling the devices.

Google plans to give multiple mobile-device makers early access to new releases of Android and to sell those devices directly to consumers, said people familiar with the matter. That is a shift from Google's previous practice, when it joined with with only one hardware maker at a time to produce 'lead devices,' before releasing the software to other device makers. Those lead devices were then sold to consumers through wireless carriers or retailers.

The expansion of direct sales marks a bid to exert more control over key features and apps that run on Android-powered phones and tablets, thus reducing the influence of wireless carriers over such devices, these people said. Wireless carriers typically handle marketing and sales of devices and thus can exert some control over the services that run on them.

The plan also aims to assuage concerns of smartphone and tablet makers that build devices using Android, many of whom are wary of Google because of its pendingacquisition of device-maker Motorola Mobility Holdings Inc., these people said.

Many manufacturers fear Google will try to boost Motorola's business at their expense, something Google has said won't happen. Under its new model, Google could give Motorola early access to Android software without putting other partners at a disadvantage, said a person familiar with the matter.

A Google spokeswoman declined to comment.

Android is the No. 1 smartphone operating system, but Google's model for the software has sometimes upset device makers that aren't chosen to work with Google on a lead device, said some industry executives.

Now Google will work with as many as five manufacturers at a time to create a portfolio of 'Nexus' lead devices that include smartphones and tablets, said a person familiar with the matter. Google also plans to sell the gadgets directly to consumers in the U.S., Europe and Asia through its website, and potentially through some retailers, this person said.

The devices will run on Google's forthcomingversion of Android called Jelly Bean, and it hopes to have the full portfolio of devices ready for sale by Thanksgiving, this person said.

Google also hopes the effort will help rev up sales of Android-powered tablets, which have lagged behind Apple's iPad and Amazon.com Inc.'s Kindle Fire, said one person familiar with the matter.

Selling devices directly to consumers online is challenging, particularly in the U.S. Many consumers prefer to test phones or tablets in a store before purchasing. The cost of most smartphones is also subsidized by wireless carriers, which sell the devices with multiyear contracts.

The new Nexus smartphones are expected to be sold unlocked, meaning they would come without a wireless contract and can run on multiple wireless networks by inserting a SIM card. Selling an unlocked phone could cost $150 or $200 more than a contract phone, and consumers would have to buy a contract separately. Google in April began selling Samsung Electronics Co.'s Galaxy Nexus on its website for $400, or about twice the amount it costs to buy the phone with a contract. Such an approach is common outside the U.S.

For Google, circumventing wireless carriers has many benefits, including preventing them from blocking certain apps. Currently, Verizon Wireless doesn't allow the Google Wallet app on Samsung's Galaxy Nexus.

A Verizon Wireless spokeswoman declined to comment.

Carriers also are sometimes slow to push through software updates to phones, and they preload apps of their own choosing on devices. By avoiding carriers, Google and its hardware partners can get devices to market faster, often by several months.

Rajeev Chand, head of research at Rutberg & Co., said Android has become a kind of 'Wild West' in which app developers have struggled to make sure apps are compatible with hundreds of different Android-powered devices. Both device makers and carriers have left their imprint on devices, meaning the 'consumer experience is highly variant,' he said.

Mr. Chand said Google's shift appears to be a move 'to create a more standardized experience for consumers and app developers,' similar to that of Apple.

Amir Efrati

• system [´sistəm]   n.系统，体系，制度   (初中英语单词)
• previous [´pri:viəs]   a.先，前，以前的   (初中英语单词)
• device [di´vais]   n.装置；器具；策略   (初中英语单词)
• amount [ə´maunt]   n.总数；数量 v.合计   (初中英语单词)
• research [ri´sə:tʃ]   n.&vi.调查；探究；研究   (初中英语单词)
• tablet [´tæblit]   n.碑；牌；匾额   (高中英语单词)
• access [´ækses]   n.接近；通路；进入   (高中英语单词)
• expansion [ik´spænʃən]   n.扩大；膨胀；发展   (高中英语单词)
• disadvantage [,disəd´vɑ:ntidʒ]   n.不利(条件)；损失   (高中英语单词)
• thanksgiving [´θæŋks,giviŋ]   感恩节   (高中英语单词)
• kindle [´kindl]   v.点燃；(使)激动   (高中英语单词)
• hardware [´hɑ:dweə]   n.五金器皿   (英语四级单词)
• version [´və:ʃən, ´və:rʒən]   n.翻译；说明；译本   (英语四级单词)
• separately [´sepəritli]   ad.分离地；孤独地   (英语四级单词)
• wallet [´wɑ:lit]   n.(放钞票等的)皮夹子   (英语四级单词)
• strategy [´strætidʒi]   n.兵法；战略   (英语六级单词)
• pending [´pendiŋ]   a.迫近的；悬而未决的   (英语六级单词)
• acquisition [,ækwi´ziʃən]   n.获得；获得物   (英语六级单词)
• forthcoming [,fɔ:θ´kʌmiŋ]   a.即将到来的   (英语六级单词)