"Regarding two critical issues with iOS versions 14.5 and above:"

[Moonbow1999]

"Concerning jailbreaking iOS versions 14.5 and above, there's been a persistent issue with Telecommunications (telecom) SIM cards losing signal. This problem first arose about two years ago with the unc0ver and fugu14 jailbreaks. It specifically affects iOS versions 14.5 and higher. Surprisingly, even with the latest Taurine jailbreak using the kfd exploit, this issue still persists.

The main reason behind this problem seems to be an elusive bug introduced during the jailbreaking process, causing disruptions to VoLTE (Voice over LTE), 5G, and CarPlay functionality. Nowadays, telecom providers have shut down their 2G networks. To make calls, you must enable VoLTE. Otherwise, you'll have no signal for calls, only data. In some regions where 2G networks are still active, you can make calls, but you won't have access to 5G, VoLTE, or CarPlay.

Currently, mobile networks like China Mobile and China Unicom are gradually phasing out 2G networks. If this issue isn't addressed soon, it could lead to a situation where none of your SIM cards can make calls. We sincerely hope for a swift resolution to this problem. Thank you immensely!"

[Moonbow1999]

[Moonbow1999]

I don't think this is a difficult problem to solve because sometimes it automatically connects to the 5GSA signal and volte will return to normal even if you don't operate the phone 😢😢😢