Radio is to improved your cell network, if u'r using hermes you'll see it in setting > system > device information. if you dont find any trouble in your shiped radio than it ok, but if you think the batteery drains to fast or the signal quality is to low, than may be you should try diffrent radio.
OFFICIAL CM 7.2.0 GT 5670 20120819 Nightly
Alfian WM6.5 V.5.1, 2.10 Olipro, 1.47.00.10, 8GB
ATOM homer285, 2GB
PROPHET CLOUDYFA 188.8.131.52 CLEAN WM 6.1, 2GB