Does a hardware upgrade TOH need to be electronic hardware? Why not something with physical function?

I'm thinking TOH could be one of those indexed pillboxes. Attach it and your phone knows to activate the meds-reminder app. This would be a killer combo for seniors.

For younger, ironic hipster-types: a cigarette case! Those haven't been popular in years. Or how 'bout a flask?

Lastly, for fans of cliche, the bulletproof other half. Because when you're carrying a smartphone, you don't need to carry a separate pocket watch or bible. You're gonna need something else to protect a small portion of your body from the projectile with your name on it.

Just some ideas for wider appeal.