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You can use the Screen Share feature on the LG 75 Inch Class 4K HDR Smart LED TV w/ AI ThinQ® (74.5'' Diag), Model # 75UM6970PUB to cast your mobile device on the the TV. When you enable screen share mode on your mobile device, the TV will be displayed in a list of available devices. You can select it from the list to request a connection. After connection is established, your mobile device's screen will be displayed on the TV...^IFV
For mirroring a phone to tablet to the TV, we would recommend using a Chromecast type device. ^CP