I apologize now if this thread has already answered this question, but I'm finding it difficult to find a straight answer. I am in the US and us AT&T's pay as you go phone service using a sim in a standard cell phone. I also have an AT&T data sim in a tablet for use on the 3G network. I would like to get a dual sim smartphone that allows for one sim to be used for voice and one sim to be used for data. I would like them to both be active. For example, I would like the data sim to be online at all times checking email and I want the voice sim online at all times listening for incoming calls/ and receiving sms/mms messages. Is this possible? Would dual sim dual standby work for this purpose or do I need dual sim dual active?