To activate 3G or 4G on Android tablets, you need to first be using a cellular company that provides this service. The 3G and 4G networks are communication protocols provided by a cellular telephone company. Therefore, your tablet must have a slot for a SIM card in order to access the cellular data network. It is also possible that your tablet came with a SIM card pre-installed and is hidden and cannot be removed.
If you have any question about if your tablet has a SIM card slot, or if your tablet has a SIM card pre-installed, please refer to the tablet’s documentation or contact the store you purchased it from.
Once you have a SIM card inserted into the slot, you need to activate the service on the Android tablet. Here is how to do that: