List of TheoryPhone models

Pre-TheoryPhone X series

 * TheoryPhone (1996)
 * TheoryPhone II (1999)
 * TheoryPhone IIc (2000)
 * TheoryPhone IIcs (2001)
 * TheoryPhone III (2002)
 * TheoryPhone IIIs (2003)
 * TheoryPhone 4 (2004)
 * TheoryPhone 4i (2005)

TheoryPhone X series

 * TheoryPhone X (2006)
 * TheoryPhone Xi (2007)
 * TheoryPhone X2 (2008)
 * TheoryPhone X2i (2009)
 * TheoryPhone X3 (2010)
 * TheoryPhone X3i (2011)
 * TheoryPhone X4 (2012)
 * TheoryPhone X4i (2013)
 * TheoryPhone X4 edge (2013)
 * TheoryPhone X5 (2014)
 * TheoryPhone X5i (2015)
 * TheoryPhone X5 edge (2015)
 * TheoryPhone X6 (2016)
 * TheoryPhone X6 edge (2016)

TheoryPhone Z series

 * TheoryPhone Z1 (2017)
 * TheoryPhone Z1+ (2017)
 * TheoryPhone FZ (2018)
 * TheoryPhone Z2e (2018)
 * TheoryPhone Z2 (2018)
 * TheoryPhone Z2+ (2018)
 * TheoryPhone ZX (2018)
 * TheoryPhone FZ+ (2019)
 * TheoryPhone Z3e (2019)
 * TheoryPhone Z3 (2019)
 * TheoryPhone Z3+ (2019)
 * TheoryPhone Z3+ 5G (2019)
 * TheoryPhone ZX2 (2019)