The firm's results suggest, of existing UK mobile users, 39 percent claim that they are planning to purchase an iPhone 5.
Just under half of those (48 percent) will pick up Apple's latest within the first six months of release.
5 or 4S?Said figures come to the fore as anticipation rises ahead of Apple's scheduled press conference on October 4 - expected to play host to the unveiling of the next iPhone.
Apple's dominance isn't guaranteed, however. Should the firm reveal only a slight upgrade to the existing iPhone 4 - akin to the leap made with iPhone 3GS in 2009 - InMobi predicts interest will wane, with fewer than 12 percent of punters looking to pick one up.
In terms of new users coming to the iPhone 5, 62 percent of current iPad owners plan to buy the new iPhone with 45 percent of Blackberry users and 24 percent of Android users joining the Apple party.
Again, these figures will shrink considerably should Apple lift the lid on iPhone 4S instead of iPhone 5. InMobi claims 25 percent of iPad owners, 7 percent of Android owners and 18 percent of Blackberry owners will set out to buy such a device.
Adding to ad growth
Any sort of iPhone boon, however, will be good news for the mobile advertising industry.
InMobi's survey reveals a 26 percent growth in mobile ad impressions over the past three months, with a 43 percent growth in impressions coming from the European mobile market.
That's a rate of expansion either iPhone 5 or iPhone 4S would only boost.
"The combination of Apple's increasing market share in mobile advertising and the general consumer interest in their latest technology is another boon for the mobile advertising industry," said James Lamberti, VP at InMobi.
"Apple is currently the clear leader in terms of compelling user experience and customer loyalty, and we feel that their quality and pace of innovation when it comes to mobile devices will continue to improve the content and advertising experience for consumers for iPhone 5 and beyond."
More details on the firm's research can be found on InMobi's website.
