I am an iOS guy but unless Apple announces a dual SIM iPhone (which is rumored), I will probably jump to Android.
First, here is a picture of the leaked dual sim part:
http://www.macrumors.com/2016/06/20/...m-trays-weibo/
Looking carefully at the part, it looks like only one of the SIMs may be tray accessible which makes me wonder whether it will be an Apple SIM on the motherboard.
Assuming Apple doesn't "save" this sale, I've at this point focuses on the Axon, OnePlus 3, or Samsung S7 (Edge). In addition to the other things we want in a smart phone (great camera, good audio, good battery life, plenty of memory, no bloatware), I want at least quadband HSPA on tray two. I too think 2g is dying. I have an ATT international data SIM which will be in my data tray and a ProjectFi SIM in the other try which might get replaced with a local prepaid. I have downgraded my ATT to 900 minutes shared with my wife and use the voice only as a backup.
I would like band 12, a good collection of global LTE bands, and a US warranty (or third purchasable warranty). Factory support of wifi calling would be nice, but Hangouts gets me 95% of what I need without it.
The Axon sounds the most appealing to me so far because of the CDMA bands built into the phone. The CDMA stuff I know is temporarily turned off:
http://www.theverge.com/2016/5/26/11...s-price-launch
but it looks like that will change either through a ZTE patch or the folks at XDA.