Acer's one of their 2015 smartphone offerings - the Liquid Z520 can now be availed thru a postpaid plan and it is thru Sun Cellular.
I took a shot of this thing in one of their Sun Shop(s) around the metro recently. The said device is free in Sun Plan 499.
The plan has unlimited calls and texts to Sun, 20 hours of mobile surfinf, 250 texts to other networks and non-stop access to Facebook and Spinnr VIP.
Some of Acer Liquid Z520's key specs are 1.3 GHz Mediatek MT6582 quad-core processor, 5 inch FWVGA display, 3G capable, dual micro SIM, micro SD up to 32 GB, 8 MP rear camera with flash, 2 MP front camera, 1 GB RAM, 8 GB ROM and 2,000 mAh removable battery.