Honda has communicated that a number of its models will be affected by the switch off of the 3G network and that the e-call service will no longer be available. It is unlikely that there is a workaround, as the vehicle's electronic systems have been designed to work with 3G data and are unlikely to be able to support 4G or 5G networks, though you may wish to contact your dealer to see if they are able to offer a solution. How the switch off affects different cars depends on the brand, as certain BMW and JLR models are affected while those from Toyota and Nissan are apparently unaffected.