All Windows Phones already come with this: it's called Wifi Sense. Technically it only shares logins with your outlook contacts but in the end it's effectively

All Windows Phones already come with this: it's called Wifi Sense. Technically it only shares logins with your outlook contacts but in the end it's effectively the same, except Microsoft-Sponsored. edit: I guess it's only secure until someone jailbreaks WP8.1