Sarah Willingham pointed out quite early on how useless it was "the instructions say 'make sure the phone is not muted'? What use is this if I've lost it?". Google's existing solution beats this, being able to bypass audio restrictions. I assume Apple has similar capabilities?
Yes there's still the other half... using your phone to find your keys... but pfft.
Aside... Sarah's contribution reminded me of how technology savvy the dragons are. There was a great moment in a previous series where Hilary Devey teased out of an applicant that they didn't own the source code for their own website. I've often slipped into thinking of them as "business people" but she very clearly understood software and licensing.
