I'm having a ROG Phone II. I've the global version and using it in India. After buying the Phone it was normal for me at the early days. But I've received some updates later. Don't know exactly the update details but after and software update received in October I'm facing this issue.
Whenever I restart the device The Phone doesn't search for network. Tried with the .12345+= test also. There is also showing that the Phone is having some radio issues. But after about an hour the Phone catches network normally. Dual VOLTE also works fine. If I hot swap Sim cards or just remove the sim cards and reinsert again while the Phone is on then also it catches signals in both of the sims in seconds. But if I restart then mobile network facilities are some sort of disabled for around 1 hour. Don't know why. Sometimes it takes 35 to 40 minutes. Sometimes it takes 1 hr 15 - 20 minutes. So I'm just not sure what have happened to my phone. Is it a software bug? Or anything then please let me know. If someone is aware of this issue and know how to solve these then please let me know.
If someone else is having the same problem and don't have any idea what's happening like me then please feel free to share in comments.