Contact Must Know Customer Service

Why should I report an Issue with Must Know?

1. AppContacter will directly Email your issue/feedback to an apps's customer service once you report an issue and with lots of issues reported, companies will definitely listen to you.
2. Pulling issues faced by users like you is a good way to draw attention of McGraw-Hill Professional to your problem using the strength of crowds.
3. Importantly, customers can learn from other customers in case the issue is a common problem that has been solved before.

1. This app includes the bonus flashcards for the Must Know series.

2. They will help you test yourself on what you’ve learned as you make your way through any of the books.

3. Each book’s set includes 100-plus “flashcards,” both “front” and “back.

1. The app loads and works for me, I guess my 4 year old phone is the correct device and with the correct settings because everyone else says that the app doesn't work for them! It's very basic, it doesn't tell you if you were wrong or right, you select a chapter from the book and you're presented with a problem from that chapter and you can select a green check mark, a question mark or a red X, it just shows you the problem and that's it.

2. My problems are similar to those in other reviews, the screen is yellow, and when I tap the pale blue button on top, it leads me to another blank yellow screen.Does not work.

3. Opens to a yellow screen with a blue rectangle.

4. Click the rectangle and a blank yellow screen is pulled up.

5. Yellow screen with blue rectangle.

6. When I tried to email the developer with the address given on the Play Store, it was returned as undeliverable.It does not work.

7. Yellow screen blue box.

8. It appears they have updated the app and it's working now.App won't work.

9. So far, so good.Didn't work.

10. You have to decide if you understand or not.The app is not working.

11. I restarted my phone and uninstalled/reinstalled the app with no success.

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

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

2. Fix Must Know Server issues & Internet Connection

1. Check network connection: An unstable Internet will make Must Know 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 Must Know not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, Must Know may not be able to connect to the Internet when running in the background.