Plugzio Cellular uses 3G and/or LTE-m bands which have better penetration than most devices.
First test is to see whether your phone has even 1 bar down there? If it does, Plugzio Cellular should work just fine. If it doesn't, we have 2 alternative solutions for you:
An electrician can install a WiFi router which can be hard-wired using Ethernet cable to the communications room (or they can install a sim enabled router where signal is available). Plugzio WiFi units are less expensive than other models - in quantity, the price savings will exceed the cost of an additional router and network (if existing reliable network isn't available). The installed WiFi router can later be used to enable communication for other chargers and/or vehicles in the garage, so its never a sunk cost.
You can also install a cell booster at your garage level. On average it costs around $1,000 to max of $5,000 to install a cell booster. This way, not only will phones have signal (especially important in case of emergency), but also Plugzio Cellular models will work with ease. Please let us know if your garage has an existing cell booster so we can help ascertain the Plugzio Cellular model that will work with it (not all boosters support LTE-m).
Each Plugzio device only requires about 10MB of bandwidth monthly. This will help you pick the right type of router and network.
Related Article: How Plugzio devices communicate with the Plugzio server
Need help with anything else? Contact the Plugzio customer care team to have a chat with one of the specialists and discuss your concerns.