Can a smartphone transmit over the 902-928MHz bands?
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.