I have doubt of LTE and it’s specifications.
LTE have TD (TDD) and FD (FDD). What are those? I think it is the Duplex Mode. What are other available modes in LTE?
Then what are cat 0, M1 / M2, NB1 / NB2 ?
What is different of there two?
When I buy a 4G sim is it have TD or FD? What are AT commands to check it?