Signal Spy - Monitor Signal St

Contains adsIn-app purchases
1.57K reviews
Content rating
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About this app


🎉**Important updates/upgrades with Signal Spy 2.0**🎉
- Total overhaul of the user experience
- NEW Preferred Network feature for Pro users
- NEW Help Center
- Android Q compatibility (including updated Dark Theme)

Download now to take back control over the device you use every day! The original Google Fi companion app, practical for ALL: Signal Spy gives you the tools you need to stay better connected all in one app.

☎️The tool to make Google Fi even more powerful
- Dialer code shortcuts to quickly switch networks and pick the best one for you (with a made-for-fi phone)

Free Features
📲Dialer codes
- Easily access dialer codes from notifications
- Google Fi users (with a made for Fi phone) can manually switch between networks with dialer codes
- eSIM / SIM switching

- Understand your connection history
- Data usage reports
- Customizable home screen widget to keep you updated on connectivity strength

❓Help Center
- Email us with any questions you have or let us know any trouble you’re experiencing
- Connect to our support page with News, FAQ, Feature Requests, and more
- Run diagnostics to diagnose and fix any issues

Upgrade: Pro Features
📡NEW FEATURE: Preferred Network (Google Fi users with a made-for-Fi phone)
- Choose to which cell network you prefer to stay connected
- Get an alert when Google Fi switches you to a different network with the option to switch back to your preferred network

🎁No ads

📲One tap switch with automatic dialer codes
- Google Fi users (with a made-for-Fi phone) can easily switch between cellular networks
with Accessibility support

🔔Set yourself data limits
- Monitor data usage with daily data limits you set for yourself that warn you when you use too much
- Limit data usage when you cross your defined threshold
- Set a data usage threshold to be automatically warned when you’re about to go over

📄Detailed history of your connections and signal strength
- East to understand History Cards with additional information of network connection history
- Detailed view for each History Card with additional data

📊Advanced data usage
- Monitor data usage and prevent data overages with variable date data usage reports
- Sortable by name or MB user
- See data used by carrier

🛠 Other tools
- App Shortcuts
- Quick Tile support
Updated on
Oct 18, 2019

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity and 2 others
This app may collect these data types
Location, App activity and 2 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

1.54K reviews
Billy Gallagher
April 11, 2021
This app has been great over the years as a Fi user, and I've found it a little easier to use than some of the others I've tried. I'd love to see a few more details about the connection strength in the app, tho, and it would be nice if it showed info about the Pixel series' Dual Connect capability. Also, unfortunately, I'm not sure how much longer it's useful without 5G support or now that Sprint has been fully merged into T-Mobile and I'm not switching between networks any more...
38 people found this review helpful
Did you find this helpful?
April 12, 2021
Hi Billy - thanks for being a loyal user! An update/upgrade is currently in the works that will include 5G support. Please stay tuned!
Gregory Gleason
August 28, 2020
What's the point? It used to show the network Information in the notification, along with a matching icon. Now it just says upgrade to pro. Home screen is the same. Seems they completely removed the useful stuff. This is yet another example of a nice independently developed app being acquired by a big box mobile app company and being destroyed as a result.
43 people found this review helpful
Did you find this helpful?
August 28, 2020
Hi Gregory. Sorry to hear you're having trouble with the app but Signal Spy ownership and development haven't changed.There are a few different things that could be causing the trouble you're having, so please email us directly at and I'll be happy to troubleshoot with you! Thanks.
Paul Emmert
October 24, 2021
This app is essentially broken. Will not invoke dialer codes manually via the clipboard, and does not automatically bring up the dialer and insert appropriate codes when that setting is turned on in accessability settings. Uninstalled and reinstalled, I was able to get it to function properly just once. After that, simply non-responsive. Device is a Pixel 4XL.
42 people found this review helpful
Did you find this helpful?
November 2, 2021
Sorry you're having that trouble, Paul! It sounds like you've already done some troubleshooting of your own but please reach out to us directly at and we can get in to the details and try and figure it out. Thanks!

What's new

- Added Fialer integration