My phone switches to 2G in some parts of the house, and some places in the garden. And, when the weather gets really bad, or if there's a long power outage, 2G

My phone switches to 2G in some parts of the house, and some places in the garden. And, when the weather gets really bad, or if there's a long power outage, 2G is the only option. I live quite far out though, so I guess it won't apply to that many.