CTExcel is the first product launched by China Telecom for overseas public customers. Highlights: the data allowance is shared between China and the UK, meaning UK plan data can be used in mainland China. Activation cannot be done in mainland China; you must activate it in the UK/Europe before it can be used in mainland China.
If you need one, feel free to contact me to purchase a brand new, activated number with a £5 balance (price: 35U).
About eSIM and roaming:
Roaming on China Telecom 4G/5G
Supports WiFi Calling
eSIM replacement supported; first switch from physical SIM to eSIM is free via the backend, further eSIM-to-eSIM swaps cost £3 each