US Cellular IMEI Checker: US cellular carriers from the United States are represented by codes: 310 066, 310 730, 311 220, and 311 580. The following IDs are called HNI (Home Network Identity). This code is created by combining two other mobile country codes (MCC) and mobile network codes (MNC). The first three numbers stand … Continue reading US Cellular IMEI Checker, CDMA vs GSM, *228 Work on US Cellular, Preferred Roaming List