GENERAL- Can I use TPG/SIMBA SIM card on myFirst Fone R1?

Please note that TPG is running by pure LTE data and they don't have 3G network or GSM voice network. Therefore, it is not compatible with our device.  Their Voice is fully running on their data network, which is why connectivity is our concern, especially at basement or some area that couldn't get their "data" network. While Singtel, StarHub and M1 do have both Data and Voice network. Which is why sometime at basement you can make phone calls, but can't make WhatsApp call. So even if the data network is bad, you still can make voice call if there is any emergency.