How to protect no apparent reasons missed calls | Calls & voicemail Support of ‎HTC One‎

Here is the solution
Step 1:
Please make sure your ring tone volume is louder enough, and we suggest you to set the ring tone at "Vibrate" mode if you are in a noisy environment.
(Slide the Notifications panel open, and then tap Settings on the upper right corner > Sound > Sound profile > Vibrate)

Step 2:
Try moving to an area with better reception. If this helps, this might be the indication that the reception is not strong enough in your area. This will impact your ability to receiving and making phone calls.

Step 3:
To prevent the data and voice connection conflict on the 2G or EDGE network, please try to use Wi-Fi or 3G network for your Internet browsing and social networking needs.

Step 4:
If you are using free voice call app (ex: LINE), please make sure your data connection is available.
(Slide the Notifications panel open, and then tap Settings on the upper right corner>make sure "Mobile network" / "Wi-Fi" is "On")

Step 5:
To exclude the possibility of conflicts from 3rd party applications, please try restarting your phone by press and hold the "POWER" button > choose "Restart" in Phone options pop up window.
For further assistance, please click "Contact" in the Customer Service.
Customer service:
If at any point you have any questions regarding an HTC product, you can always contact one of our customer service representatives in a way that is convenient for you.
Contact: http://www.htc.com/www/contact/phone/

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