Voice quality super !! Unfortunately, the use of two SIM cards is not as easy as all other buyers have indicated that. Had a card for calling and for the Internet. Hard to tell which card is in which use where insert and adjust as needs and then everything works but not the way you thought. It also does not look at which card you now go to the Internet. Thought that is always visible, before use. Perhaps someone comes better with more smartphone-experience with it rightly.
