In the US, it depends on what part of the 900mhz range your using on whether it is a licensed transmission or not.
If you use the 902–928 MHz (centre frequency 915 MHz), this is unlicensed and is called the ISM Band. (Such as cordless phones, or some wifi gear)
However, other 900mhz frequencies other than the ones I listed above are licensed. (Such as Cell phones)
This should help:
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