unable receiving calls from China

ironface8 wrote:

syaoran wrote:

This is more than likely due to the Chinese cellular network blocking the absilty to make calls to  the United States.  Try having someone call you while you are connected to WiFi with WiFi Calling enabled.  

Thank you. But I've already tried turning on Wi-Fi calling, yet the issue persists. When a US phone calls me, it directly connects to voicemail. However, I can't access any voicemails.

I have the same issue. When I use roaming, I can make calls, receive calls from China, but unable to receive call from places outside of China like US. This may be due to Tmobile's inability to use LTE in China to make and receive calls, see unable to make and receive phone calls in Mainland China | Comunidad de T-Mobile. It turns to GSM to make calls, but unable to receive calls.

More detailed explanation: T-mobile cooperate with China Mobile and uses its network in China. For LTE, China Mobile has TD-LTE frequency band unique to China. T-mobile may not support this TD-LTE frequency band. Although China Unicom has  FDD-LTE frequency band compatible with T-mobile and AT&T, T-mobile did not cooperate with China Unicom and can't use their network. For GSM, In US, T-mobile and other providers are abandoning GSM, while in China GSM is still used. So there may also be compatibility issues using GSM.

When I use WIFI calling, I'm able to make and receive calls by changing DNS server. Be aware that China may block some internet communication using DNS cache contamination. So you may need to change the WIFI setting like this: Choose IP settings as static instead of DHCP, then change the DNS server to some other available server, not controlled by China, like 199.85.127.10 provided by Norton DNS, see Norton DNS - Norton ConnectSafe.

In this way, you may use WIFI calling to receive calls from outside China. Just use a VOIP phone number is also a solution.