I have some time to test Sony XPERIA Z3 Dual, which is best Dual SIM smartphone for this year. I was waiting how dual sim feature work, because Sony Mobile write on website this:
With our new dual SIM feature you can talk on one SIM and still receive calls from the other, instead of going to voicemail.
Bud if you are talking on one SIM card, second SIM card is not available. You can enable Dual SIM feature with redirecting, but it cost money from your provider(depend on you plan) and it dont work correctly on my phone. So if you use one SIM on data and one for calling, it is without problem. But if you receive calls on both SIM card, Sony XPERIA Z3 Dual is not active Dual SIM. I know that active dual sim version will cost more money and have lower endurance, but Z3 Dual is not cheap. Are you happy with Dual SIM function in XPERIA Z3 Dual?