Iphone mini? I don't know, but an iWatch... maybe:
http://crave.cnet.co.uk/accessories/...ntel-50010069/
Should be able to connect it (via bluetooth) to answer your phone (iPhone, for sure) or check your sms without using your actual phone!
P.S. Sony already have one in the process:
http://www.sonymobile.com/gb/product...es/smartwatch/