Calls go to voicemail 5Q

[tomgawron]

I have TMobile my calls go to voicemail. I have found that if I set to 3g it works fine. But this defeats the purpose of a faster 4G phone. I have been to T-Mobile and they tried resetting the APN but nothing works. I will never buy a Asus phone again. If anybody knows how to fix this please let me know tgawron@aol.com

[tomgawron]

I can't be the only person having this problem in the U.S. ?

[Christine_ASUS]

Hi tomgawron
Thank you for your asking. Kindly provide the information below so that we can better assist you.
1. Your current firmware version
Settings>System>About Phone>Software information
If you try to update to the latest version, does the situation still persist?
https://www.asus.com/supportonly/ZenFone%205Q%20(ZC600KL)/HelpDesk_BIOS/
2. If you insert other carrier's sim card, does the situation remain the same?
3. Does the issue appear right after any system/apps' download or update? Can you use 4G before?
4. Can your device use 4G before?
5. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check on any disturbance from the installed 3rd party apps.
# How to enter and exit "Safe Mode"
https://www.asus.com/support/FAQ/1005163/
https://www.youtube.com/watch?v=Q5AJ4kNGCFs

[tomgawron]

Software is the latest, Some times it works fine but if phone is sitting unused for a while call go straight to voicemail.Nevrr never worked properly on 4g from day 1. I tried multi sim cards and t-mobile support. They say asus phone is not compatible with there system. I had been using on 3g but now 3g is disappearing.

[Christine_ASUS]

Hi tomgawron
Thank you for your reply. Kindly refer to the chart below as the tech specs of ZC600KL, please check with local carriers to see if they support the below channel bandwidths, and weather the channel bandwidths are used for 4G usage or not.

https://www.asus.com/us/Phone/ZenFone-5Q-ZC600KL/Tech-Specs/
If you have any question, please do not hesitate to let me know.