Cyber Monday was the first $2 billion mobile shopping day in the U.S.

Online sales on Cyber Monday rose 17 percent year over year to $6.6 billion, according to estimates from Adobe Analytics, marking the biggest online shopping day in U.S. history — and the first $2 billion mobile shopping day, as well.

Shopping on smartphones accounted for about $1.4 billion of sales on the Monday after Thanksgiving, while shoppers making purchases on tablet computers contributed around $600 million of the day’s revenue.

Over the past few years, retailers have pushed out more online deals on Black Friday and even Thanksgiving Day as more people have mini computers in their pockets and are comfortable shopping on the go. But Cyber Monday has maintained its status as the go-to day for online shopping deals.

According to the National Retail Federation, 81 million U.S. residents shopped online on Cyber Monday, compared with 66 million on Black Friday, the second-most popular internet shopping day of the holiday weekend.

The most popular shopping app in the U.S. on Cyber Monday was Wish, according to estimates from the app analytics firm Apptopia, with 48 percent more daily users than the No. 2 app, Amazon.

While mobile shopping is on the rise in the U.S., adoption still remains far behind some international markets like China. During China’s biggest shopping day, Singles Day, 90 percent of Alibaba’s $25 billion in gross sales were transacted over mobile devices.

This article originally appeared on Recode.net.

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