While you can buy Acer computers in the US you have to import its smartphones. This will end in May when the company will launch the Acer Liquid X2. It's a 5.5" phablet with three SIM slots. Three SIM phones are pretty rare, but even dual-SIMs are not that popular in the US. Acer has added a 64-bit octa-core processor, 13MP camera and a massive 4,000mAh battery. The company already has one three-SIM phone, the 5" Acer Liquid E700, but this is clearly a higher-end option. Unfortunately, there's not much more info about the Liquid X2. Acer will be offering Quick Flip covers, which have a tall, narrow window for notification display. The phone is coming in May, hopefully the price tag will arrive a bit...
Source: http://www.gsmarena.com/acer_to_launch_trisim_liquid_x2_in_the_us_this_may-news-12028.php
