The compatibility of the "ThinkPad Fibocom L860-GL-16 4G LTE CAT16 M.2 WWAN Module" with your Lenovo X1 Carbon 11th Gen (Type 21HM) is guaranteed, as it was specially developed for the X1 Carbon Gen 11. If the module is not compatible for any reason, you can usually return it, provided that it is in an unused condition and the retailer's return policy conditions are met. It is advisable to check the retailer's returns policy to ensure you get your money back.

The ThinkPad T14s Gen 4 with AMD Ryzen 7 Pro supports WWAN modules based on M.2 A Key. A suitable module would be the Fibocom L860-GL-16 4G LTE CAT16 M.2 WWAN module, as it uses the same interface. For 5G support, however, there is no specific information about a compatible module for this model.

I can't answer that. The best thing is to call Lenovo Support. They can check exactly which modules (serial no.) are compatible with which model (serial no.).

Unfortunately, according to Lenovo, there is no suitable network card for expansion. Only preconfigured P14s versions with LTE/SIM connectivity are available. If you would like to know more about this, please contact our customer service.