A new LG device carrying the model number LG UK750 was spotted in a HTTP user agent profile
As you can see in the screenshot below, The model number of this new handset is LG-UK750. The User Aagent String also revealed that the LG UK750 runs Android 6.0.1 build MXB48T.
U.S. Cellular and LG has released two LG-UKXX devices, namely the LG UK495 (LG G Pad F 8.0 Tablet) and LG UK41 (LG G Pad 7.0 LTE Tablet).
The LG UK750 could be a variant of the LG G PAD X 8.0 tablet for the U.S. Cellular.
The LG G pad X 8.0 is avialalbe now from T-mobile, and it will be available soon from AT&T.