I recently bought a brand new white xiaomi note 3 pro (on 16/04/2016), higher speced version with snapdragon CPU, 3GB RAM and 32GB ROM
I just found out that the pro version doesn't support optus data share sim, as you can see on the posts here, one from me and one from the other user
the same data share sim works great on MTK version of the note 3
http://en.miui.com/thread-289896-1-1.html
http://en.miui.com/thread-268244-1-1.html
there might be fix to it but I just can't be bothered doing the research trying to find the solution.
using data share is the only purpose that I bought a dual sim phone like xiaomi.
so I am wondering if there is xiaomi note 3 (MTK) user who is willing to exchange their phone for a brand new upgraded note 3 pro in the original box.
it's a nice upgrade for you if you are not using optus data share sims.
the MTK note 3 best to be white, new looking with no scratches, higher speced, non defective unit.
I am in sydney, I am thinking meet in person will be the best way to exchange the phones.
I reckon your issue is with the apn settings. I also use dual sim phones and have had some issues in the past with data connections. Try these and see how you go;
http://www.optus.com.au/shop/support/answer/our-mobile-phone…
Either that or try switching the sim trays
Also note that within about 12 months your second sim wont work for 2g. Check out the mi5 as the two sims can run 3g on one, 4g on the other