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Mobile search is an evolving branch of information retrieval services that is centered on the convergence of mobile platforms and mobile phones, or that it can be used to tell information about something and other mobile devices. Web search engine ability in a mobile form allows users to find mobile content on websites which are available to mobile devices on mobile networks. As this happens mobile content shows a media shift toward mobile multimedia. Simply put, mobile search is not just a spatial shift of PC web search to mobile equipment, but is witnessing more of treelike branching into specialized segments of mobile broadband and mobile content, both of which show a fast-paced evolution.
Market description 
"Competition for the US mobile search market promises to be fierce, thanks to the large US online ad market and strong pushes by portals. By 2011, mobile search will account for around $715 million, or almost 15% of a total mobile advertising market worth nearly $4.7 billion", according to a leading market research firm; eMarketer. Depending on a researcher's particular bias toward telecom, Web or technology factors, the published forecasts for global mobile search vary from $1.5 billion by 2011 (from Informa Telecoms & Media) to over $11 billion by 2008 (according to Piper Jaffray).
Mobile search is important for the usability of mobile content for the same reasons as internet search engines became important to the usability of internet content. Early internet content was largely provided by portals such as Netscape. As the depth of available content grew, portals were unable to provide total coverage. As a result Internet web search engines such as Google and AltaVista proved popular as a way of allowing users to find the increasingly specialist content they were looking for. In an international journal article, 'Exploring the logic of mobile search', Westlund, Gómez-Barroso, Compañó, and Feijóo(2011) outline a thorough review of research on mobile search usage, and also present an in-depth study of user patterns. They conclude that mobile search has started to change mobile media consumption patterns radically. They also emphasize that future developments of mobile search must be sensitive to the mobile logic.
There is a similar situation developing in the mobile content industry. Given early adopter usage of mobile services, there has been a vast increase in the depth of content developed for mobile phones. There are now few large organizations that do not offer a mobile service of some sort. Most of the operators run their own portals that showcase the best available content. However, given the limitations of a mobile phones screen size and general navigability, most of available content that has been written for mobile users is effectively invisible to users. Research from Qpass suggests that less than 36% of an operator's portal is within 30 seconds navigation distance for the user - this being the expected time users expect to find content in.
Beyond navigation is location-aware technology for mobile search. Mobile local search is 30% of all digital searches with a surge in growth expected world-wide in 2010. What is Mobile Local Search (MLS)? Are all searches local? What are the component technologies of a powerful MLS application? How can advertisers purchase inventory ad units available within the application structure? Mobile Local Search is the search and discovery of persons, places, and things within an identifiable space defined by distinct parameters. These parameters are evolving. Today they include social networks, individuals, cities, neighborhoods, landmarks, and actions that are relevant to the searcher’s past, current, and future location. These parameters provide structure to vertically deep and horizontally broad data categories that can stand-alone or are combined to comprise searchable directories.
Thus, MLS can occupy several application categories/directories simultaneously. This is a double-edge sword for product designers and developers, analytic engines, financial media analysts, and media planners and buyers needing to evaluate one category with another or one directory with another. The lack of clean comparative analysis based upon application occupancy of an individual category creates a challenge for marketers looking to maximize the value of applications to the supply chain including brand marketers looking to embed advertising within an application.
Types of mobile search 
Within the broad umbrella of mobile search (the ability to browse for mobile specific content), there are a range of services. Given the relative immaturity of the market, not all of these can be expected to become the industry standards.
Mobile optimized search engines 
Most major search engines have implemented a mobile optimized version of their products that take into consideration bandwidth and form factor limitations of the mobile platform. For example, Google has launched a mobile-friendly version of their search engine. The algorithms for mobile search engine results are thought to be evolving and aspects such as location and predicitive searching will become increasingly important.
Mobile question and answer services 
These services allow a user to text a question to a central database and receive a reply using text. A usage example would be a user that wants to know the answer to a very specific question but is not in front of his/her computer. Most mobile 'Q&A' services are powered by human researchers and are therefore a type of organic search engine. A new approach by AskMeNow and MobileBits is to use Semantic Web technology to automate the process.
Mobile directory search 
This service is known by different names dependent on country and operator. It can also be known as 'Find My Nearest' or 'Mobile Yellow Pages' services. The basics of the services allow users to find local services in the vicinity of their current location. The services often use location-based technology to pinpoint exactly where the user currently is. An example of usage would be a user looking for a local cab or taxi company after a night out. Services also usually come with a map and directions to help the user. An example is the service offered by Yell in the UK which is powered by MobilePeople's technology.
Mobile discovery services 
These services offer users recommendations on what they should do next. An example would be recommending a user a similar ringtone to the one that s/he has just browsed for. They operate, in a mobile context, in a similar way to the recommendation engines provided by internet retail shops such as Amazon.com. An example of real usage is the Directory Enquiries (DQ) service operated by Orange in the UK. Callers to the Orange landline DQ service are given the business and residential numbers they have requested verbally by an operator. In addition, Orange sends the information in text format to the users mobile phone. The information contains a text reminder of the requested information as well as links to local businesses, services and other interesting information in the local area that the user has searched on.
These services provide the indexing structure to the portals provided by mobile operators. They index the content already on the operators' portal but also provide users access to mobile specific content that is available outside the confines of the portal.
Dynamic mobile selection interface services 
A new category of mobile search tool that is emerging is one in which a pre-selected set of possible search content is downloaded in advance by a mobile user and then allows for a final internet search step. An example of such search tools is the Worldport Navigator for the iPhone, which provides users with a push-button experience of selecting from thousands of human-screened and categorized Web selections in three or four seconds, without the need for text entry, search, result review, or page-scrolling.
Main providers 
|Name & Mobile URL||SMS#||Country||Description||Launch|
|UK IE||Founded by ex-Symbian and Psion CEO Colly Myers, AQA uses human researchers to provide answers to any free form search queries or customer questions. It was the first company to provide such a service using only a premium short code and not a mix of shortcode and keyword.||2004|
|AskMeNow||27563 (ASKME)||US CA||Gives users the option of searching for information using an SMS short code, a WAP 2.0 site m.askmenow.com, or mobile applications. Uses natural language search that allows users to ask a question and receive an answer. AskMeNow has a carrier deals with Rogers Wireless and Bell Mobility in Canada and Alltel Wireless in the United States.||2005|
|Bing Mobile from Microsoft||1 800 CALL 411 (voice)||US?||Users have the option of searching from their mobile browsers, download client applications specifically designed for Windows Mobile and BlackBerry devices, or searching by voice, from any phone, by calling a toll-free number.||2006-11|
|US||An SMS and voice natural language-based question answering service by ChaCha (search engine), allows users on any carrier network to ask any question on any subject and the answer is provided by a human "guide", innovative because it enables Internet users (only with a US work permit) to earn money by finding answers.||2008-01-03|
|Fabasoft Mindbreeze||AT||Mindbreeze takes care of mobile information access to all enterprise resources including content conversion to fit all kinds of mobile devices.||2005|
|466453||US||Offers Google SMS which allows users to obtain information by texting in structured syntax to an SMS shortcode. Limited to the categorical information they offer. Google has carrier deals with Britain's Vodafone, China Mobile, and KDDI Corp. in Japan but not specifically for the SMS product.||?|
|GTIP and other co-branded customer implementations||61199 (UK)
82149 (IE) (closed)
83246 (UK) (closed)
83149 (UK) (closed)
|UK IE DE||Launched by AlienPants initially as a generalised service but later deliberately limited to computer game cheats, the service is made available to multiple customers under each customer's own brand, such as T-Mobile as the 'T-Mobile Cheat Service', or as GuruGold in support of the on-screen 'Games Guru' on Sky One's primetime computer games program 'Gamezville'; first in-print co-branded service, in association with GamePlayer magazine, appeared in the magazine in May, 2004.||January 2003|
|InfoSpace||?||?||Provider of meta-search, a technology by which they search the search engines and allow users the ability to search Google, Yahoo, Ask and Microsoft at the same time. Infospace also provides local search services and offers many of these services to mobile carriers, in a white labeled approach.||?|
|Jumptap||?||?||JumpTap offers white-label mobile search.||?|
|Picollator||?||?||Users upload an image from their mobile phones and search for relevant resources. Designed for Windows Mobile and Nokia devices.||January 2008|
|Taptu||US UK||Mobile specific, built from the bottom up for mobile uses. It's differentiated from Google's and Yahoo's mobile search in that it only returns mobile results whereas the others may return links to non-mobile websites which may not render properly on a mobile phone; also offers refined searches for images, music, videos.||2008|
|Texperts(formerly Re5ult and 82ASK)||66000||UK||SMS-based service that uses a mix of human experts and sophisticated algorithms to provide bespoke answers to any customer query; founded by Thomas Roberts, Sarah McVittie.||2003-08|
|Didikle||TR||Didikle is an English, Spanish and Turkish semantic mobile search engine. It parses questions and gives proper quick answers, augmented with regular web search, optimized for mobile devices.||2007-05|
|Yahoo! Go||92466 (US) (YAHOO)||UK US||A mobile local search that is offered via mobile applications. Yahoo! has a search deal with British carrier Hutchison 3G UK Ltd.||?|
- "Mobile Search in the US". eMarketer.com.
- "The Search Wars Are Going Mobile". eMarketer.com.
- Westlund, Oscar; Gómez-Barroso, José-Luis; Compañó, Ramón; Feijóo, Claudio (2011). "Exploring the logic of mobile search". Behaviour & Information Technology.
- "Mobile Local Search Saturates Profit over LBS Vendors, Advertisers, and Search Application Developers". fiercewireless.com.
- "Worldport Navigator for the iPhone".
- "Yahoo! oneSearch. Get answers with search designed for mobile".