I am Sherwin from SIngapore.
I am new here, so please be kind. I am not sure if this information is useful or to the point correct.
I recently email IMDA. And this it the email i sent to IMDA and the reply i got.
it seen to me is ok to use 868MHz or 915MHz as long you follow the power limit <= 500mWeirp
You may want to refere to this: https://www.imda.gov.sg/~/media/imda/files/regulation%20licensing%20and%20consultations/ict%20standards/telecommunication%20standards/radio-comms/imdatssrd.pdf?la=en
I was fortunate to contact a member of the Telecommunications Standards Advisory Committee for IMDA. He told me this “as long you conform to the allowable spectrum plan and does not exceed the radiated Power, and spectral bandwidth limit at that unlicensed frequency as specified in IMDA’s handbook on the use of the unlicensed frequency, that’s fine.”
Hope this information is useful and do correct me if my information is wrong.
And have a nice day.