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1. Other than that it's an awesome app, very accurate speed wise, not location wise.if you want a good tool to use to test wifi strength or mobile data signals, then this is the go to app to have on your devices.

2. When a mobile phone is connected to pay data the speed test works fine but when the same device is switched over to Wi-Fi the app cannot find a server.

3. This sudden loss of function in the app is the same across several different Android devices so it is definitely not a hardware issue here.Inexcusable bug whereby the data transferred is not scaled based on the connection being Wi-Fi or cellular.

4. Thankfully the mobile version doesn't have ad's all over the screen like the desktop version (you still get an ad after running the test that pops up though)Something wrong with this app in the past 48 hours.

5. Also you have a choice of the server and service provides for running the speed test.

6. If this excellent performance holds up for the next couple of weeks I will give it a full 5 stars, again.When the screen changed along with the other associated changes with the update you destroyed this app.

7. This is good but it would have been nice to have received a response from the developer to my numerous inquiries regarding the issues I had been experiencing.

8. I have been using this app for years now measuring my speeds and it has the availability of different servers in different locations.

9. It's really not bad, I trust this app more than open signal and any other 3rd party speed test.

10. When I tested cellular, getting great speeds, but my data alarm went off immidiately.

11. They add new features and keep updated frequently, pretty accurate, has a log book of your previous tests, and looks good.

1. Fix Speedtest Not Working/Crashes/Errors/Unresponsive & Black/White screen:

1. Restart Speedtest: Restarting the app will resolve most errors.
2. Update the Speedtest App. Here is how:
   1. On Android goto PlayStore » Search for "Speedtest" » Open Speedtest by Ookla » click "Update".
   2. On iPhone, goto AppStore » Your profile » Available Updates » Check for Speedtest » click "UPDATE".
3. Clear Speedtest by Ookla app cache: Clearing cached data will force your app to retrieve the latest data directly from Speedtest servers.
   1. On Android, goto Settings » Apps » Select "Speedtest by Ookla" » click Storage » click "Clear Cache".
4. Check Speedtest app permissions. If any of these permissions required to use your device's features are disenabled, Speedtest might not work.
5. Uninstall and reinstall Speedtest. If nothing else has worked, completely uninstall Speedtest then reinstall.
6. Restart your device. Last, restarting your device can often clear most problems causing Speedtest not working

2. Fix Speedtest Server issues & Internet Connection

1. Check network connection: An unstable Internet will make Speedtest be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
2. Disable VPN: VPN can cause connection errors and lead to Speedtest not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, Speedtest may not be able to connect to the Internet when running in the background.