Can I activate HFR?

[gorasiberia]

Phone is a 8310, can I activate/deactivate HFR anyway?

Thanks.

[Yotamz]

there is no HFR.
there is EFR (enhanced full rate) and HR (half-rate)

HR:
to activate:
*4720#
to deactivate:
#4720#

EFR:
to activate:
*3370#
to deactivate:
#3370#