We use Netgear Nighthawk with Sunrise 4G. Although this router is referenced as the best solution for 4G, we have encountered a lot of issues. Connection fails several times per day and does not necessarily restart automatically, so most all our connected devices do not function well. We tried different settings (config interface has tons of options), but nothing really helped. If we put this card into a mobile phone we do not have this problem, so it seems related to router.