The described method and system enables a telematic operator to determine a connectivity standing of devices requiring a port change from one wireless carrier to another. In particular, a modem initiates a call to each affected mobile directory number (MDN) and verifies connectivity to the correct vehicle using a telematic authentication encrypted key with appropriate verification of the stored MIN, electronic serial number (ESN), and station ID (STID). The list of verified devices of good connectivity is used to facilitate the MIN change to those telematic devices whereby a higher probability of success is most likely to occur. Moreover, by distinguishing devices most likely to commit a MIN port on the first attempt, a potential impact population whereby success is not likely is also developed, so that further appropriate scrutiny or action can be executed for problematic devices.