Area coverage check is unavailable.
Our Wi-Fi router has the ability to pick the most suitable network for the corresponding area.
4G/LTE is available in major countries and in urban areas.
There is a possibility that the signal weakens if you are near an airport, mountainous/coastal area where it is surrounded by nature, underground, or tall buildings.
Also, you might feel that the network becomes unstable when you are crossing country borders, inside a moving vehicle or train, etc. due to the device switching its network.
On such occasions, long press the power button of the Wi-Fi router for 15 seconds; and try to use it again after restarting it.