I came across a remote control that uses the 902-928MHz band. Can a smartphone transmit WiFi/Bluetooth over those frequencies? If yes, is there anything special about it?
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Can a smartphone transmit over the 902-928MHz bands?
Maybe, depends on the cellular system it is designed to interface with.
Can a smartphone transmit WiFi/Bluetooth over those frequencies?
No, both bluetooth and most wifi implementations target the 2.4GHz band.
Sure -- you could theoretically change the physical layer to transport over a different frequency band but that would require design of new radio frequency circuitry. It is not a simple software solution.