Today I tested NordVPN in iPhone and Windows10.
An important addition after the test is completed：
I found another version of NordVPN that has the NordLynx protocol. And this agreement must be downloaded in the App store. Its name is: NordVPN IKE-Unlimited VPN. I just downloaded the test and found that using this protocol, it can be connected in China.
In addition, according to user tests in my forum, Android can also connect through this protocol in China. The test content is in Chinese, if you want to view, you can click: Nord VPN 使用 NordLynx 协议连接目前质量较高，全平台可用。Thanks for @mortyy。
[/su_note]iPhone NordVPN NordLynx Testing：
Starting Time：May 31, 2020, 8:55 AM；
Connection Protocol：NordLynx
“Quick Connect”：USA #7190：Succeeded；(Connection Time：<5s)
Speedtest Ping：228ms；Download：7.9Mbps；Upload：32.7Mbps；
“Quick Connect”：Japan#2162：Succeeded；(Connection Time：<5s)
Speedtest Ping：98ms；Download：1.26Mbps；Upload：12.6Mbps；
“Quick Connect”：USA #7190：Succeeded；
“Quick Connect”：USA #7190：Succeeded；
“United Kingdom”：UK #1476：Failed；
“Canada”：CA #1094：Failed；
IOS NordVPN Protocol：5.7.6（216）
Win10 NordVPN NordLynx Testing：
Starting time：May 31, 2020, 9:27 AM；
Connection Protocol：NordLynx
“Quick Connect”：USA #7190：Succeeded；(Connection time：<10s)
Speedtest Ping：227ms；Download：15.8Mbps；Upload：61.45Mbps；
“Quick Connect”：USA #7190：Succeeded；
“Quick Connect”：USA #7190：Succeeded；
“Japan”：Japan #542：Failed；
“Malaysia”：Malaysia #14：Succeeded / But it cannot use internet；
“Latvia”：Latvia #32：Succeeded / But it cannot use internet；
“Italy”：Italy #125：Succeeded / But it cannot use internet；
Win10 NordVPN Protocol：6.29.7.0
Precautions：I have not find the protocol NordLynx in Macbook now. I have not a Android Phone, but my reader tell me, Android have protocol NordLynx, so I think it will be succeeded.
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