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Subscribers of 3G cellular systems are becoming increasingly attracted to the use of packetized voice services on their data-enabled wireless devices. Voice over IP (VoIP) cellular radio connections are characterized by a set of air interface parameters that may be quite different from those used by conventional, circuit-switched speech connections. This work is aimed at quantifying the impact of such differences on the level of non-ionizing radiation on the head of voice users. It follows a line of research that looks at the statistics of head exposure levels from a system perspective, that is, considering the cellular device not as an isolated piece of equipment but as a part of a cellular network. The study focuses on smartphones, and considers two types of packetized speech services, namely, VoIP using standard protocols and the proprietary system known as Skype®. The methodology employs Monte Carlo simulations of the radio uplink of a R'99 W-CDMA system, in combination with experimental radio emissions data from a group of popular devices. Results indicate that, as a general rule, VoIP connections always bring in an increase in key statistics of the level of emissions absorbed by the head of voice users, as compared to circuit-switched connections. Specifically, under a certain set of typical conditions, the increase in average radiation levels may be as high as 60%. As a result, a number of recommendations aimed at mitigating the rise in radio emissions associated to the use of VoIP instead of conventional voice services are formulated.