I have the Huawei Watch 2 LTE and using a nano-sim for the connection. in Settings > Connectivity > Cellular, the only option available is to OFF/ON cellular, which impacts on both Voice & Data connections unlike in Phone.
So does this concern with the Smartwatch hardware limitations, where it cannot split the Voice and Data when turning OFF? When I am on Wifi then the Mobile Data turns Off automatically and Voice/Text works as usual without Mobile Data.
The same Sim in an android phone is able to Turn Off Mobile Data and can receive Calls and SMS but in android watch when turned off, entire carrier goes offline.
if Phone Technology and Watch technology are the same, then is this issue belongs to software limitations?
found similar topics below without an explanation: @androidcentral disable cellular data but still receive calls