Advice needed for selection of portable cellular gateway

So far we have set up wifi networks at remote places using Verizon Jetpack cellular wifi gateways. However sometimes the Spark does not connect to our cloudserver and I would like to remotely login to the cellular gateway and check what is going on. Currently we can not remotely monitor correct functioning of the gateway. Can you recommend a good affordable cellular gateway that has 3G/2G/1G fallback and remote monitoring capabilities?