An inspection system and method for inspecting a user's entitlement to use a service, in particular a transport service, includes: sending, by a mobile inspection device, at least one first inspection data set during a first transmission phase; receiving, by at least one mobile user terminal to be inspected, the at least one first inspection data set; outputting, by at least one first output module of the mobile user terminal, at least one first inspection feature during the first transmission phase, based on the received first inspection data set and at least one user's entitlement information item available in the mobile user terminal, and outputting, by at least one second output module of the mobile inspection device, at least one first validity feature corresponding to the first inspection data set during the first transmission phase.