We're looking to move from a data plan to an unlimited plan... we have 4 cell phones and 1 router. The router is only used at a remote cabin to monitor a thermostat and needs virtually zero data. We currently pay $10/month and it appears if we go to unlimited we have to switch that over too... which appears to now be $60/month. This would be a deal breaker for us... is there any other option to have a router with limited data on our plan?