4G or 5G standard
Hi
The manufacturer of my daughter’s smart watch (imoo z1) requires a SIM card with 4G standard. Banal question about this - are all 5G cards automatically “downsize” capable, i.e. can they also be used with a 4G-oriented device, or is it really possible that the new SIM card is not recognized because it is only compatible with a 5G-compatible device device can be used?
Thank you very much for your help.