Well I've been out and about today and mine has been switching from GPRS to EDGE and to HSDPA, I'm now back at my office and it is fixed to HSDPA, whereas for the whole morning and yesterday it was fixed to GPRS.
The signal strength has dropped a lot while on HSDPA and is on about -90dBm (approx 2 bars) compared to -70 odd when on GPRS, so I'm guessing that the problem is with the HSDPA signal.
I haven't had chance to call voda yet but will do in the morning.
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