My toothbrush is one of the most “identity-locked” objects I own — no one uses my toothbrush except me. You can borrow my sweater, my car, or the shirt off my back, but not my toothbrush.
While disposable to a great degree, mobile phones have a similar aura of personal identity about them. Like many people I carry my cell phone at all times, an indispensable bit of personal property, almost more crucial than my wallet. Many people personalize their phones with special covers, carrying cases, and with ringtones. Ringtones, amazingly, have come an expression of your personality; you not only play them for yourself but for everyone around you, and a ringtone is part of your public persona just like your clothing and hairstyle.
Cross-posted from The Pebble and the Avalanche