sentences:  True 3G systems such as EV-DO, W-CDMA (including HSPA) provide combined circuit switched and packet switched data and voice services from the outset, usually at far better data rates than 2G networks with their extensions.All of these services can be used to provide combined mobile voice access and Internet access at remote locations.4G networks provide even higher bitrates and many architectural improvements, which are not necessarily visible to the consumer.