The invention relates to a method for accessing at least one service. A host device is coupled to a chip. The chip stores data relating to at least one test Subscriber Identity Module (SIM) type application and/or data relating to at least one SIM type application. The host device sends to the chip a command for switching from a first application to a second application. The first application is either a test SIM type application or a SIM type application. The second application is either a SIM type application or a test SIM type application. And the chip carries out an activation of the second application and a de-activation of the first application. The invention also relates to a corresponding system for accessing at least one service.