It can be solved, but it is troublesome, in theory, buy a wireless route that can do WDS connection and install it in a place that can receive signals from the window, make a WDS connection between your route and a router that can receive its wifi signal, and then your phone uses your own route. But here's the catch: Not all routers with WDS capabilities support WDS connections between different router models. Most routers only support WDS connections between routers of the same model.