USAT
- abbr.超小孔径终端(Ultra Small Aperture Terminal);美国陆军运输船（或飞机）(United States Army Transport);美驻台陆军(United States Army, Taiwan)
USAT-
Before SAT / USAT application technology , the relationship between the phone and SIM card is master and slave . It means that SIM card is totally in a passive acceptance of mobile instruction , and Phone is in the absolute Active Control status .
在SAT/USAT技术获得广泛应用之前，手机与SIM卡之间是一种不对称的主从关系，即SIM卡只能处于被动的接收手机的指令并执行的地位，手机则处于绝对的主动控制地位。