The mobile signal strength diaplayed on the front of the E585 varies between '2G' '3G' and 'H'. The latter indicates that you have a high speed HSDPA connection (sometimes known as 3.5G) which should provide greater Internet performance than 3G. With poor reception, I have also seen it occasionally downgrade to '2G' which will provide modem equivalent data speeds limited to 48Kbps. The quoted maximum data speeds are as follows:
Connection Maximum Download Speed Maximum Upload Speed