Why is the connection slow or unstable on my LTE router if my internet provider has excellent LTE quality?

That can be the case if the router is set to automatically assign to any service type, because then it can connect to 2G/3G instead of LTE. Depending on the model of the router, you need to go to its interface page and enter Internet settings – there you can change Preferred service type from Automatic to LTE only/4G only, and that will force the router to connect only to LTE, hence improving speed and stability.

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