No HSPA service?

Thank you very much for your answer.

I was wondering: The fairphone has obviously a receiver for the frequency bands 850/1900Mhz. However, it can only handle GSM on it.
Why is that? Is there so much hardware coding involved or is that a driver issue? Sounds like I could in general recieve the frequency - just not process it the right way.
Does anyone know the details of GSM / HSDPA / hardware of the recievers?

Cheers, Polly