Not really I'm afraid. I use Three because it's literally free until I actually need to use it, which is hardly ever. They give you 200MB per month and with tuning that's enough for gateway monitoring and occasional testing.
I will say that if speed is a big consideration for you you should get an external 4G modem device like a Netgear LB2120. You can get actual LTE speeds from that where as the driver limitations in FreeBSD mean you won't ever see more than 42Mbps from the EM7305. I usually see something ~20Mbps here.
Steve