Hello, eugeneparker
4G + displayed on the phone indicates that the phone supports LTE-A carrier aggregation technology (also known as a 4G plus) 4G network. It also shows that there is a 4G plus signal nearby. In theory, the transmission rate of 4G plus is faster than 4G, but the actual rate is related to the base station. Maybe the 4G plus signal rate near you is too low to connect to the network. This is not a malfunction, it just reflects that the network construction of the operator is not perfect.
Thanks!