Over one million iPhone owners have downloaded the Opera Mini web browser app from the App Store since its launch last week.
Apple took the best part of a month to decide whether or not to approve the Opera app and its arrival brings the iPhone in line with other mobile operating systems.
German app developer Alexander Clauss developed an independent alternative to the Safari browser, but Opera Mini is the first of the big-name browsers to get official sanctioning from Apple.
"An app has to be written especially for a particular phone to offer a high quality experience. On many mobiles the browser provided with the phone is the only choice someone has," industry analyst Ian Fogg told BBC News.
Mr Fogg pointed out that the iPhone is unlikely to see official versions of browsers such as Firefox or Internet Explorer because the developers of these programs will not want to work with the iPhone platform.
Opera's Christen Krogh said that the app was supported by advertising revenue and that the mobile market was gradually becoming a more potent money maker for firms who had found previous success on the internet.
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