What 3g/4g modem should i put with ignition platform and with certain serial plc

i want to monitor certain machine through 3g or 4g
currently we are using 3g device called sp50 connected to machine through serial or analog /digital input points then this device send data through cellular network to 3g modem connected to our scada sytem what 3g/4g modem should i put with ignition platform and with certain serial plc
like sp50 in clear scada

Hi said_sayed,

Could you provide any links or documentation about the devices you are trying to connect?