Soft copper wire : 20 gauge ( wire diameter 0.8mm ) : 2 x 15cm ( 6 inch) 28 gauge ( wire diameter 0.3mm ) : 20cm ( 8 inch) 1.2cm spherical stone (cat's eye stone) ...

For a growing number of iPhone owners, the most basic promise of a smartphone, waking you up on time, has become unreliable.