OK so as I understand it, an Xfinity modem sends out 2 signals, one called xfinitywifi that anyone can connect to and 1 called something else that only the owner with the password can connect to. However to use the xfinitywifi connection you really need an Xfinity account and need to input your username and password on the opening webpage or else you can't get past that webpage. My sister has an Xfinity account, and my neighbor had one too, so I just used my sisters password to connect to my neighbors xfinitywifi, but my neighbor recently moved, leaving me without internet. My question is, if I buy an Xfinity modem, will it automatically send out that xfinitywifi connection that I can connect to, or do I need to buy a subscription service from Comcast for my xfinity modem?