A:AnswerThis has nothing to do with a cell phone. This would extend your already existing wireless network in your home. IF you already have internet, and you already have a wireless network in your home, then this device would boost that wireless network. Again, this has nothing to do with a cell phone.
A:AnswerI have not seen any problem when switching from extended network to original network, but I have not tried to watch a streaming movie while switching. You may need to pause the movie, switch the network, and then un-pause.
A:AnswerIf you're asking how to connect to the manufacturer website then that is www.belkin.com.
If you're asking how to setup the device, then you should read the instructions that came with the extender. They were pretty clear.