Deutsche Telekom, which is behind the software download service, says the app store has more than 15,000 downloads available and cover everything from business software, games, navigation, communication and organisational tools.
Apps can be either downloaded direct to a handset or to a PC and then side-loaded onto a mobile phone.
Softwareload also offers a 12-month download guarantee, that allows users to store their purchase securely online in case they need to install it on a new mobile device during that period.
"Consumers and business people alike are using mobile devices far more often for work or entertainment on the move. As a result they're demanding wider access to exciting new apps to make the most of their mobiles," said Dirk Lebzien, head of Softwareload.
"With the launch of our UK mobile store on Softwareload.co.uk, shoppers can choose from more than 15,000 software titles that they can quickly and securely install onto their mobile device."