Put a QR barcode on your headstone so your cell phone addicted relatives can visit you virtually after your death!
Someone needs to add this to their next undead/vampire/zombie novel. Embed a GPS chip under the skin and encode the frequency in the QR code. Anyone who wants to know can download the QR code from the headstone and be notified the instant future undead boyfriend is on the move. Get to him while he's freshly undead. :D