Apple's customers not only love buying Apple devices, they also love using Apple devices to spend more money at online and mobile commerce sites.

Shoppers using an iPad spend $115 per transaction, and those using iPhones for online payments spend $82 per transaction on average, according to Adyen's quarterly mobile index report.

Those using Android tablets average $93 per transaction, and those using Android phones spend $75. Payments technology provider Adyen tracks browser-based mobile payments across its global customer base of more than 3,500 businesses to produce its quarterly reports.

"Data from our study and others consistently point to higher average ticket values or spend on iOS devices," said Karman Zaki, North American president of Adyen.

The numbers may indicate that "those who buy iPhones have a higher average income" or on a global basis there are a lot more Android phones and models that would skew the data, Zaki said.

Either way, most merchants would tend to develop e-commerce sites to be compatible with the iOS platform before Android, Zaki added.

The quarterly index measures only browser-based mobile payments, so the numbers would be even higher across the board when including the growing popularity of in-app payments, Zaki said.

Regardless, the numbers are showing the power of Apple and its loyal customers.

"Maybe that's why the largest issuers in the U.S. were on board with Apple Pay when it first launched and Apple also has some larger players on board in the U.K. ahead of their upcoming launch for Apple Pay (on July 14)," Zaki said

In addition to higher transaction values, the number of online payments initiated through iPhones continues to grow, even though use of iOS tablets for payments is waning.

The index revealed iPhone devices account for 35.6% of all browser-based transactions made from a mobile device, and are now used for 10.2% of all global online transactions, up from 8.6% at the end of last year.

However, the iPad, which dominated the mobile commerce scene with almost a 50% market share in March of 2013, now accounts for only 28.5% of all browser-based mobile transactions, the report said.

"A lot of people use tablets, but they use them in their home or office," Zaki said. "Your phone is now with your 24/7, so you are more inclined to pull it out when doing a quick transaction."

Clearly, smartphones have become the "undisputed king of mobile transactions," Zaki added. Use of smartphones for payments increased to 64.1% of all mobile transactions in the second quarter from 61.8% in the first quarter.

It's not just the work of iPhones. Android smartphones increased to 28.3% of mobile transaction volume in the second quarter from 27.2% in the first quarter of this year.

As for specific markets, the U.K. continues to lead the way in mobile transactions, with 44.8% of online payments being initiated through a mobile device.

"The fact that phone-based transactions are growing rapidly at the expense of tablet-based transactions is indicative of a global consumer trend toward greater and greater mobility," said Richard Oglesby, senior analyst at Double Diamond Payments Research.

Tablets are no longer mobile enough for many consumers, who prefer to "shop and buy on the run instead of at their desks or on their couches," Oglesby said.

The Adyen numbers bode well for digital wallet providers and companies that enable those wallets, Oglesby added. "These firms will see increasing demand for their services as merchants adapt to these evolving preferences," he said.

With headquarters in San Francisco and Amsterdam, Adyen technology enables businesses to accept online, mobile and physical point of sale payments with more than 250 payment methods and 187 transaction currencies.

Among others, Adyen provides payments services to Facebook, Airbnb, Spotify, Groupon, Evernote,, Viagogo, Yelp, Vodafone, Mango and Netflix.

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