The explosion of mobile over the last few years has been staggering. By next year, the twenty billionth mobile phone will be sold. And not only are there many more mobile devices, but we’re all becoming more reliant on them. In fact, nine out of 10 consumers in the U.S. keep their phones within reach 24/7.

This has significant ramifications for retailers, particularly for online commerce, where mobile commerce already accounts for 30 percent of US e-commerce and is expected to grow 300 percent faster than traditional e-commerce. What does the coming year hold for mobile commerce?

Here are the top six mobile commerce trends to watch in 2016.

1. Physical and online worlds will continue to converge.

If your brand has a large US audience, chances are good your customers are going to be engaging with you across devices. About two-thirds of Americans own at least two digital devices (a desktop, smartphone, tablet or laptop), and more than a third own all three. And they’re not only using multiple devices, but they’re also interacting with your brand in ways that are blurring the lines between the physical and online worlds.

Retailers are highly aware of the overlap between online and physical channels.In response, they're offering an increasing array of online and in-store options, including:

• Curbside pickup, as offered by Target and Kroger. Interestingly, brands like Target are partnering with third-party apps like Curbside rather than using their own apps.

• Online reservation and purchase of goods and services, such as the online reservation of clothes to then be tried on in-store at Sears or tire-changing services at Pep Boys.

• Same-day delivery of items by a range of retailers, including Macy’s, Target, Walmart, Kohl’s and Nordstrom.

• Beacon-enabled features including targeted offers, loyalty rewards and mobile payments. Eighty-five of the top 100 retailers are planning to adopt beacon technology by the end of 2016. And Business Insider expects beacons to have a direct influence on more than $44 billion in US retail sales in 2016.

Whether it’s in-store-first technologies like beacons or online-first services like curbside pickup, it’s clear that 2016 will be a year in which retailers will leverage technologies across the digital and physical channels to offer their customers the best of both worlds in one seamless experience.

2. Social commerce will remain hot, but will buy buttons deliver?

There is a very strong connection between social media and mobile. In the realm of retail, social media is a significant force. Consider that:

• In 2014, the top 500 retailers earned $3.3 billion from social shopping.

• Social shoppers are spending more money online than ever before.

• Social-driven retail sales and referral traffic are increasing at a faster rate than any other online channels.

2015 was a big year for social commerce, with the launch of buy buttons on Twitter, Pinterest, Instagram and Facebook. Although Pinterest, for example, has 60 million Buyable Pins, buy buttons have yet to gain wide traction on any social platform, turning in a performance over the holidays. However, given the importance of social in terms of both traffic and revenue to m-commerce sites, social buy buttons—and whether they gain a foothold with consumers or not—will be an important trend to watch in the coming year.

3. The mobile web will continue to outpace apps.

More than 85 percent of mobile time is spent in apps. That’s pretty staggering. A quick glance at this number would indicate that offering an app is an imperative in 2016. But if you dig one level deeper, it gets really interesting: Eight out of every 10 minutes of app time are spent solely in an individual’s top three apps. Across industries, the web drives twice the site traffic of apps. In fact, of the top 30 US retailers, only two—Amazon and Walmart—drove more than half of their visits via their apps.

As for revenue, only about 20 to 30 percent of a retailer's mobile sales come from their app, according to Forrester Research. It’s not surprising, therefore, that Forrester’s “The State of Retailing Online 2015”report found that 56 percent of retailers said mobile apps would not play a major part in their mobile strategy.

To be clear, apps can certainly play a key role in retailers’ mobile strategies, particularly for their most loyal customers. And thanks to deep linking and Google App Indexing surfacing relevant app content in mobile search, traffic to apps will surely increase in 2016. In fact, 40 percent of Android searches turn up app-indexed results. But given its clear leadership over retail apps today, the mobile web will no doubt continue to eclipse apps as the biggest revenue driver for retailers in the coming year.

4. Consumer expectations will drive retailers to focus on mobile moments.

Consumers rely on their smartphones during countless moments throughout the day. In fact,  91 percent use their smartphones while completing another task. And as they become more reliant on their mobile devices, consumers expect to get exactly what they need at the moment they need it.

This mobile-moments mindset presents retailers with unprecedented opportunities to engage their customers on mobile. Whether consumers are pulling out their smartphones to conduct a product search over breakfast, using the store locator feature to swing by a retail location after work or pulling up a scannable rewards card at the register, mobile moments enable brands to provide their customers exactly what they need in their immediate contexts.

One challenge for many retailers is that popular approaches for adapting desktop experiences to mobile, such as responsive web design, fall short when it comes to delivering contextual experiences. To keep up with their customers’ needs during their mobile moments, retailers who are relying on responsive design to deliver their mobile experiences will need to solve for the limitations of responsive (for example, by applying mobile experience optimization on top of their responsive sites).

But regardless of the technology they use, in 2016 we will see more retailers focusing on creating mobile experiences that deliver exactly what their customers need in their immediate contexts.

5. Loyalty will eclipse convenience in driving mobile payments.

Tim Cook of Apple declared 2015 the “Year of Apple Pay” when the service launched in October 2014. Yet one year later, it only accounted for about 1 percent of total transactions in the U.S. Mobile wallets in general have been slow to take off.

One historical challenge was that not all retailers accepted mobile wallet payments. But even today—with 1 million merchants accepting Apple Pay, for example, and the mass upgrade to EMV compliant terminals (which means many more vendors in 2016 will be accepting mobile wallet payments than ever before)—most consumers will not start using Apple Pay and Android Pay.

The challenge is that mobile wallets do not offer enough incremental convenience to shift user behavior—at least not in the next year. A far more significant shift for mobile payments in retail in 2016 is being driven by retailers themselves: mobile payments via retailers’ apps. Starbucks already drives 16 percent of its total transactions from payments via its mobile app.

Walmart also recently launched its own payment system, Walmart Pay. And Target, according to Reuters, is planning to develop its own mobile wallet as well. The success of retailers’ mobile payments—and where they can succeed where mobile wallets have struggled—will lie in the connection with their customers via loyalty rewards tied into their payment apps.

The Starbucks app, for example, will automatically let you know how many times you’ve visited a Starbucks for coffee and when you’re due for a free cup. Of course, only the largest retailers with the most loyal customer bases will really see a significant impact from mobile payments in the coming year. And mobile wallets, if they can integrate loyalty rewards, would challenge retailers’ apps.

But the story here isn’t one of one retailer’s app versus another or even retailers’ apps versus mobile wallets. It’s about the customer and improving the mobile customer experience. And while most retailers won’t see many of their customers paying via mobile payments in 2016, mobile payments will experience some growth in the coming year. In fact, eMarketer expects mobile payments to grow by 210 percent in 2016.

6. The growth of mobile will force brands to optimize mobile checkouts.

Retailers are losing $18 billion annually due to shopping cart abandonment. And research shows that more than two out of three users who add items to their online shopping cart leave without making a purchase. The numbers are even worse on mobile, where conversion rates are 70 percent lower than desktop.

However, 2015 was a pivotal year for mobile shopping. This holiday season, for example, mobile played a bigger role than ever, with a 45-percent increase in mobile traffic and and 82-percent increase in revenue. In fact, smartphones generated more than 57 percent of traffic and nearly 30 percent of revenue over the holidays. And with mobile commerce expected to grow 300 percent faster than traditional e-commerce, more brands will focus on implementing a seamless checkout experience in the coming year.

All of these trends will generate some buzz in the coming year. And more importantly, they will all create unique opportunities for brands to provide their customers with better mobile experiences in 2016.