Right, the green arrows going grey is not a problem. The more serious problem is that the 700p loses the connection, or the network drops it (not sure which is the case) even when there's no software instruction to disconnect.

However, with the 700p you CAN receive a phone call when the arrows are green. On Verizon, at least, this is true even when the connection is 1XRTT and not EVDO.