One thing I am wondering about when observing people in trains and restaurants in significant numbers now using smartphones to access Internet based services is what kind of effect his has on the shift of voice calls from GSM over to UMTS? Before the smartphone boom, I knew many people who bought a new UMTS capable mobile device but locking the device to 2G only to conserve battery power. I don't know too many people who do that anymore. When using a smartphone and Internet based services, locking the device to 2G for whatever reason is the last thing people want to do now. Consequently, voice calls that would have previously been made over the 2G network are now made over 3G and therefore reducing the load on the 2G network. The effect is likely countered to some degree by rising voice minutes per user per month in many countries but from a 2G/3G voice call distribution point of view I can very well imagine smartphones making a difference today.