I have an old network extender that i think was 1X. My new galaxy s10 shows the network extender icon but when i dial #48 it says i am not under 4G lte network extender coverage. Since i have the network extender icon does that mean i have my old 1X coverage? which is fine since i use the wifi for any data connection.
I want to do all I can to advise you about this device's capabilities. Do you have the model number so that we can check on the details? If so, please provide it here in the thread.