Hey there-yeah-count yourself VERY fortunate you don't need that second SIM slot. Once an area is upgraded, look out. In my case, thankfully things worked out-but that's because Amazon did right by me. I was outside of the timeframe for returns but they recognized that it was genuinely a problem that I couldn't have become aware of until the timing I did, because I was getting calls on SIM 2 fine in areas 30 miles west of where I live, thinking my phone was fine, but then when I started getting calls later in the day when I was actually at HOME, but , a few weeks later, that's when I found out that things were NOT fine. I had no way of knowing. And I had changed SIM cards twice and gone through a full RMA and several support chat sessions with AT&T so Amazon could see I really tried. But in the end, AT&T concluded that my area is upgraded and the 2G towers are shutting down bit by bit and therefore I'm not going to get a reliable connection in that 2G slot and that even includes just for phone calls. Well, that's totally worthless. It's disappointing as it's a great phone otherwise for those who only need one number. But as a dual SIM, let me tell you-it does not work and ASUS needs to make their next one with double LTE slots or just make it single SIM, period and lower the price because they are duping people into thinking it is functional as a dual SIM when there are people like me in upgraded tower areas. I wasted so much time with this, and ASUS doesn't think they owed me anything back. Amazon thank goodness thought of the customer experience. What is ASUS thinking of making that second SIM 2G? In any event, again, I am relieved as I got my money back and the phone is gone and on its way back to Amazon today already. I'm back on my Note 3 and using my cheap Alcatel actually on my second line right now since it uses a micro SIM. I do have a 1520 Lumia but it uses a nano SIM and I just don't feel like changing SIM cards again, then having to change again if I opt to get the Pure XL, and so forth-this is getting tiring! I happened to have the Alcatel from before when I added the second line before I decided to get a real phone for it so I kept it as a back-up. Glad I did-it's coming in handy in the interim.
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