used a two-step process
to update dynamic OD matrices. In a recent study by Ran (2013), CDR data were used to identify relatively complex
travel paths of mobile phone users. Calabrese et al. (2013) used CDR data to extract useful information on individual mobility
patterns from cellular phone traces. There have also been efforts to extract trajectory characteristics and spatio-temporal
distributions from CDR data (Hoteit et al., 2014).