The title references the song "Don't Stop Til You Get Enough" by Michael Jackson.
The Z-Phone (as shown when Tracy is getting a Z-minder) is simply a Motorola Q8 (a model released in 2005), decorated in pink glitter.
Miley's O-Phone (as shown when she's calling Tracy) is a BlackBerry 7100t (a model released in 2004), decorated in glitter.