The web services group said the portal would offer users the most "realistic interpretation of a full online experience" on a mobile to date.
The portal gives users 30 days of continuous login to their email accounts and they can also customise their homepage and content channels to reflect their preferences.
Users can choose to place content from , including Premiership club news, weather or horoscope information, directly on their mobile homepage.
They can also access other content channels on their phone, such as news and sport, which are also pulled directly off AOL.co.uk.
AOL's Web Surf service allows users to enter any website URL and the site is then transcoded down for the consumer to view on their mobile phone.
All navigation pages feature space for a relevant banner ads, and key channels are broken out with sublinks for quick navigation.
Ariel Eckstein, vice-president of business expansion at AOL, said: "[The new portal] will raise the bar of how people can expect to interact with the internet via their mobile phones.
"Throughout the process we have always been guided by the very strict principle of understanding how consumers want to experience the internet on mobile devices.
"The simple functionality and relevant and customisable content are a clear reflection of AOL's ability to deliver simple but innovative products that respond to emerging consumer demands."
AOL is also offering advertisers space for targeted mobile banner ads across the AOL network and Third Screen Media network, the mobile advertising business it recently acquired.
Dana Dunne, chief executive of AOL Europe, said: "This launch of the UK mobile portal is a very definite milestone in AOL's development as the world's largest and most effective advertising network as well as a leading provider of content.
"With mobile portals operating in the US, France, Germany, India and now the UK, we are in an ever stronger position to offer advertisers original and highly targeted channels to reach their audiences."
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