(CNN)-- Today, it seems that most Americans always have three things in their pockets or wallets: keys, wallets, and phones. But, no. too- In the distant future, you can leave your wallet and keys behind you. Mobile phones are staging a coup. Within five years, some analysts say, mobile phones in the United States will be able to make electronic payments, open doors, enter the subway, clip coupons, and possibly become another way of identifying. In countries such as South Korea and Japan, the future use of these phones is becoming a reality, and in terms of mobile technology, these countries are usually ahead of the United States. A 963- For example, a personal survey by Forrester Research found that 15% of Japanese mobile phone users used their phones to pay and buy products in stores. These ideas have also been tried in the United States, but have been less successful. In late 1990 and early 2000, banks and handset makers began experimenting with the United States. S. customers. A limited number of people have been given the ability to scan mobile phones to pay, enter the stadium and use public transport. Those phone- Ed Contz, a senior analyst at Forward, said forwarding guinea pigs didn\'t like the new features as expected, and the ideas never took off on a commercial scale. But now, says Kountz, there is a strong interest in merging phones with wallets and keys. 2009 of people rely more on mobile phones than before. \"I think it\'s different this time,\" Kountz said . \" He believes that mobile phones in the United States will be used for mobile payment within five years. \"The overall utility of mobile phones has expanded and more consumers are using the data side of mobile phones,\" he said . \". According to the International Telecom Union, the United Nations agency, by the end of 2008, an estimated 4 billion mobile phone users worldwide. This is about two mobile subscriptions per three people. Mobile phones are everywhere and are usually used to access the Internet and computing, which means they are ready to go beyond wallets, said Justin Denison, vice president of strategy for Samsung Telecom in the US. Gartner Inc. A technology research firm released a report in 2009 saying mobile payments would grow by 70% to 73 million people worldwide. By 2012, 0. 19 billion people will make mobile payments, the company said. Nevertheless, the adoption rate is relatively low. Gartner says only 3% of North America\'s people are expected to make mobile payments in 2012. The potential problem, Mr. Denison said, cannot guarantee that the technology will be as popular in the United States as it is in Asia. \"We can invest. We can test it. But this is not always the case [ New technology \"Adopted here,\" he said . \". The technology to turn mobile phones into credit cards and ID cards poses several potential problems. If mobile phones replace wallets, Lily Coney, deputy director of the Center for Electronic Privacy Information, said thieves would see everyone walking down the street talking with their mobile phones as a target for robbery. \"This is definitely the final form of identity theft,\" she said . \". Banks and handset makers say the technology is safe. But it is unclear whether consumers will demand change. Simon pug, vice president of the NFC Forum, which supports the technology, said there is no clear plan to decide who will pay for adding the technology to mobile phones and stores, and MasterCard\'s head of mobile payments. \"Any new technology needs to develop an ecosystem to make it work,\" he said . \". \"New hardware is one of the key factors that need it. A special chip is needed in the mobile phone and another radio frequency antenna is needed for communication. . . And spend money. \"Sweeping the contents of a person\'s wallet onto his mobile phone depends mainly on a kind called proximity- Field communication, allowing any enabled device to communicate with the cash register or Metro turnstile through a safe radio frequency. The technology is similar to scanners and passes, allowing commuters to pay for driving on toll roads without parking at toll stations. When the phone is enabled near- On-site communication technology, shoppers can load bank and credit card information onto their phones, then scan them, buy items at grocery stores, gas stations, set to read the subway of the device or anywhere else. Doug Brown, head of mobile product development at Bank of America, said the idea was popular with consumers because it simplified their lives. \"You don\'t need cash anymore. You don\'t need your wallet. \"It\'s really the last game and we can replace the physical wallet, all the cash needs and the plastic that you\'re using today,\" he said . \". Similarly, the phone can also contain scanned identity information. Eye scans and fingerprints will make phone ID cards and payments safer, Brown said. The ID technology may work like a company security badge and when scanning, it extracts personal information. Some hotels already have the idea of using nearby hotels Enable the guest\'s telephone to act as the on-site communication technology for the room key. According to the NFC Forum, a hotel in New Zealand installed a lock opened with a mobile phone last month. People who send text messages and barcodes can trade with their phones at a lower priceTechnology also means. Mobile Banking app through the Internet, people can transfer and buy goods online. In some parts of the world, text messages sent by mobile phones are used as a form of currency. In Kenya, for example, more than 6 million people have registered M- Pesa is a service that lets people send text messages for payment and transfer money from the phone to the phone. Susan Teltscher, head of market information and statistics at the International Telecom Union, said some of these users used banks for the first time because of their mobile phones. IPhone users in the United StatesS. Elsewhere it is already possible to upload the ticket to their phone and then scan the digital version of the ticket barcode instead of presenting the paper ticket. Hopefully, in the end, bank customers here can use a personal barcode to buy goods in the store. Kountz, an analyst at Forrester, said the recession could hinder many of these ideas. Consumer interest in mobile payments is still low: less than 10%, he said. Still, many companies and consumers want to get rid of plastic cards, bulky cash and bulky wallets. For them, it\'s just how and when --- Who will pay.