Through Digikey RevX there are some new data plans that cover up to 50MB for $6/month
Using Digi LTE CAT-M1 modems, with Verizon SIMS from Digikey, transmitting 8 values, taking readings every 15minutes, and attempting reliable transmission every 2hours, in a riparian valley in a remote area of N California, (so retransmission when the wind blowing wrong direction or fog) I’m seeing about 2.5Mbytes a month. Well within the 50MB.
CAT M1 – 50MB STARTING AT $6 PER MONTH (US & NORTH AMERICA)
► AT&T CAT-M1 50MB @ $6 ( $0.40/MB OVER ) – US / CA / MX – (no lines present)
► VERIZON CAT-M1 50MB @ $6 ( $0.40/MB OVER ) – USA – 1 LINE(s)
I guess should check LTE