Wireless in the iPhone 7: everything you need to know

How do the iPhone 7's wireless features compare to previous versions?

The iPhone 7 is here, and it's new in a number of ways. But one of the ways in which it is improved was largely glossed-over during the keynote: it now supports faster wireless speeds.

While there isn't as drastic an improvement this year over previous years, there are still some significant cellular-related upgrades inside the chassis.

The 450 club

The iPhone 7 now supports maximum speeds of up to 450Mbps, which is a 50% jump over the iPhone 6s. Specifically, the new iPhone is a Category 10 device, which means that in addition to being able to reach those astronomical speeds of 450Mbps in the downlink (downloading data from the internet), it is able to reach speeds of 100Mbps in the uplink.

To reach these speeds, the iPhone uses a technology under the LTE standard called carrier aggregation, which combines several wireless channels, or bands, to transmit data to and from a phone. The iPhone 7 supports 3x CA in the downlink — up to three distinct bands carrying data — and 2x CA in the uplink. Unfortunately, those uplink speeds can only be achieved using a combination of Band 7 and Band 41, which currently precludes all U.S. carriers.

The carrier question

Unfortunately, the iPhone 7 can only reach those ludicrous speeds with help from a carrier, which facilitates the transmission of data between a phone and the internet.

In the U.S., T-Mobile and Verizon currently support 3x carrier aggregation; Sprint and AT&T support 2x CA, which is supported on the iPhone 6s, up to 225Mbps.

Of course, 225Mbps or 300Mbps are theoretical speeds that are unlikely to be hit in regular conditions. In Canada, Bell has launched 3x carrier aggregation in some markets, but I have only achieved those speeds under very limited circumstances, with the average speeds settling around 50 to 80Mbps.

A question of compatibility

Like the iPhone 6s, the iPhone 7 supports 25 LTE bands, allowing it to work on almost every country with developed 3G or LTE networks.

In the U.S., Apple continues to offer two versions of the iPhone, one optimized for AT&T and T-Mobile, and one another for Sprint and Verizon, since the two latter networks still use CDMA technology. But because the latter model supports the same 3G and LTE bands as the former — it just omits the CDMA support — it should work on AT&T and T-Mobile, provided the SIM slot is unlocked.

This year, Apple is also doing things a little differently when it comes to country-specific versions of the iPhone. Unlike last year, there is no China-specific version of the iPhone 7; compatibility with China Mobile and China Telecom has instead been included in the same CDMA-based version as the one sold in the U.S. However, there is a Japan-specific model of the iPhone 7 that supports the country's homegrown tap-to-pay system, FeliCa.

Making phone calls

The iPhone 7, like the two iPhones before it, supports a number of improvements to voice-based communications, too. Voice Over LTE, or VoLTE, is becoming increasingly common in the U.S. and Canada, and is rolling out to providers elsewhere in the world. By putting voice communications over the same LTE network as regular internet traffic, the iPhone no longer has to drop down to 3G to initiate a phone call, resulting in faster connections, better quality, and — best of all — the ability to remain on LTE during that call.

And for carriers that offer it, the iPhone 7 supports Wi-Fi Calling, an incredibly important feature for those whose homes and workplaces don't always have consistent cellular signal.

Reception

Speaking of consistent signal, the iPhone 7 does away with the visible antenna lines that have graced the back of the last two generations of iPhones, moving them to the edges of the phone's rear.

According to Apple, cellular reception should be as good, if not better, than previous models. While a spokesperson would not confirm what measures were taken to allow the iPhone 7 to better hold onto remote cellular signals, the presence of an upgraded baseband chip, combined with an improved antenna design, should give Apple's new phone an edge over previous iPhones.

Your turn

What would you like to know about wireless technology in the iPhone 7? Let us know below and we'll try and answer it.