Does it matter if sim card is program for 3G will it work on 4G?
A 3G sim card does not have the ability to be used for a 4G network. It can be put in some devices that say they are 4G but the sim card itself will only be using 3G still in that case.
3G sim card only works on 3G network. 4G sim card only works on 4G network. Is this correct? thanks
A 3G sim card cannot work on 4G. A 4G sim card works on a 4G network and 3G if being used in a compatible device.
Example: some phones that are 4G say that can also be used as 3G so if the sim card in that device is a 4G sim it can use 3G since the device allows it.