You Can See More: Project Fi: What it's like switching between three networks?

The following article Project Fi: What it's like switching between three networks? is courtesy of Android Central - Android Forums, News, Reviews, Help and Android Wallpapers

Switching between networks isn't scary, and in fact it's quite useful.

Usually when you sign up for a phone carrier, you're just getting service from that one carrier. That's not the case with Project Fi, which lets your phone actively switch between T-Mobile, Sprint and US Cellular. It's a big selling point for the service, and when you add in Wi-Fi calling and texting it looks like quite the network juggling act.

After using Project Fi for some time, it turns out the regular switching between networks isn't all that confusing after all.

Switching between T-Mobile, Sprint and US Cellular

Project Fi, when paired with a capable phone like the Google Pixel 2, is set up to intelligently choose between T-Mobile, Sprint and US Cellular's networks depending on which one is offering a better signal at the time. We don't really know how Google's deals have been worked out or how the phone determines when to choose one network over another — and with a Project Fi SIM in your phone, the "Cellular network settings" go blank except for a single toggle to toggle mobile data and data roaming (which you wouldn't ever worry about turning off anyway). That means you don't have any control over which network your phone uses, but it's not actually as scary as it first seems.

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In our time using the service all around the U.S., we've seen the phone latch onto T-Mobile primarily, typically only moving to Sprint in some rural areas where T-Mobile had weak or no LTE signal to offer. As Sprint has improved its average speeds and reliability over the past couple of years, we've started to see it used more and more as well. Typically, you're most likely to see T-Mobile in dense cities, and Sprint in more rural areas where T-Mobile may not have expansive LTE coverage. You're only likely to see US Cellular in the regions where it actually runs its own network.

The most interesting thing to note is how seamless the transition is between networks when the phone decides to switch. There actually isn't any indication on the phone when it switches, and no matter which network you're on the phone will always display "Fi Network" in the status bar. You can use an app to see which network you're on (SignalCheck is popular), and that's the only way to keep track of the network switching. Most importantly there isn't any change in the experience that indicated a switch had been made — no delay, no cutoff and no slow data.

The network switching is seamless, and simply expands your speeds and coverage.

While there are technically ways to explicitly choose just one network or the other, we wouldn't actually recommend that. Considering how smooth the transition is between networks, there's little reason to bother with manually switching or sticking with one — and it really defeats the purpose of paying what are still above-average per-gigabyte data rates to get access to all three networks.

The one clear downside of this network switching is the lack of simultaneous voice and data when your phone is on the Sprint network — meaning if you receive a call, you won't be able to use data at the same time if your phone happens to be connected to Sprint. This really is the only reason to try and "force" the phone to one network or another ... and the only annoyance of this opaque network switching.

In all, it's a win. Project Fi manages all three networks really well to the point where you can't perceive the changes, and the parts of the country where the networks don't overlap simply gives you more room with data than you'd get by going with a single network.

Then you add in Wi-Fi

Plain old carrier networks aren't the only story here — there's also a significant part of the Project Fi experience that leans on Wi-Fi (hence the name). The first part of this is built-in Wi-Fi calling and texting, which can utilize your current Wi-Fi connection instead of the cellular networks. This only works when your Wi-Fi connection is deemed fast enough for calls (it doesn't require much speed), but it'll seamlessly drop to the cellular network if necessary without any intervention. This works in the built-in Phone dialer and Google Messenger apps.

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This means you can call and text no matter where you are, even out of cellular range, but perhaps the nicest feature about this Wi-Fi calling and texting is that it doesn't require any intervention or settings manipulation on your part. Simply pick up the phone and call or text, and it'll go out over whatever network will handle it. And because your "Fi Basics" charge covers unlimited talk and texts, you don't have to worry about which way it's routed.

The other part of the Wi-Fi story with Project Fi is the so-called "Wi-Fi assistant" that automatically connects you to open Wi-Fi as you move about. This is one of the less-understood parts of the service, but it's pretty basic once you know what to expect. If you choose to keep your Wi-Fi turned on at all times and let the Wi-Fi assistant scan for networks (as is the case by default), your phone will automatically connect to any completely open Wi-Fi network that it finds and is "verified as fast and reliable."

It will only connect to networks that are completely open — that is, no password, splash page, "click here to connect" or "watch this advertisement to connect" getting in the way. While at first you may think there are plenty of open networks around you, many of them actually require this extra step of a splash page or some kind of authentication that'll keep your Project Fi phone from connecting. But because you don't have to actively manage it, it's always nice when you look down and see your phone has been saving mobile data by hopping on a coffee shop's free Wi-Fi.

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It'll connect to fewer networks than you'd think, but when it does connect it works well.

When your phone does find a completely open Wi-Fi network that it can connect to, it'll connect and you'll be using it for data instead of the cellular network. You'll also automatically be connected to a Google VPN service, which is completely free, and tunnels your connection past the inherently insecure Wi-Fi network and through Google's servers to hit the outside Internet. This is good for your own security, and also helps give you a consistent data connection. When the connection degrades or you start to leave its location, your phone will hand off back to the cellular network — including an ongoing call.

Living the multiple network life

So long as you don't try to tinker much and simply trust what the phone and service can do automatically, you'll be satisfied with the network switching and automatic Wi-Fi access in Project Fi. Having open access to T-Mobile, Sprint and US Cellular means there are fewer places where you'll be left without a mobile data connection. And in areas with bad speeds from one of the three carriers there's a good chance the other two can pick up the slack instead. Network redundancy is always a good thing.

And in places where you have access to Wi-Fi — be it a known network or an open one out in public — the built-in Wi-Fi calling and texting features, along with the help of the Wi-Fi assistant, will let you keep using your phone in areas with bad mobile networks or just to save you a few dollars a month in data usage. It's simple, and for the most part it works — it's a truly useful part of the Project Fi experience.

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