The O2 Priority app is the highest new entry in this week's BR chart, while Facebook stays top ahead of eBay mobile.
The O2 app was launched in September and gives members of the network's Priority rewards scheme an easier way to check on the offering.
MailOnline, the new and initially free app from the Daily Mail, has dropped two places to number four after its debut last week.
Another new entry in the top 15 is Thetrainline, which recently introduced the ability to buy tickets through its app.
The chart is powered by analytics app developed by with non-commercial branded apps removed.
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