Dear randers4:
I sold an iPhone, and I forget to erase it (dho!...). I did enable Find my iPhone on it and can issue a remote erase command via the iCloud website. However, the SIM card was removed, so presumably the phone has to connect to the internet via WiFi. But to do this, the it seems that the new owner must connect to a WiFi network using some password, so he must open the phone with the passcode to access WiFi settings. I'd rather not give him my passcode and access to the phone contents to do this.
I would be very grateful if you could shed some light on this dilemma!