contains(S60_VERSION, 3.1) {

        # In S60 3.1 we need to use TMobilePhoneBookInfoV1 instead of TMobilePhoneBookInfoV5.

        # Note: Etel testsserver uses V5 always.

        !contains(DEFINES, SYMBIANSIM_BACKEND_USE_ETEL_TESTSERVER) {

            	DEFINES += SYMBIANSIM_BACKEND_PHONEBOOKINFOV1

        }

        # S60 3.1 device will reboot when removing several nonexisting contacts in

        # sequence. The first remove operation will succeed but right after the second

        # remove operation has completed the device reboots. To prevent rebooting

        # we read the reserved slots before and really remove those contacts that

        # really exist.

        DEFINES += SYMBIANSIM_BACKEND_CHECK_BEFORE_REMOVE

    }

    # In pre 10.1 platforms we need a small delay between requests to prevent

    # S60 3.2 devices from rebooting and S60 5.0 devices from reporting a

    # server busy error. Not sure if this is really needed for S60 3.1 but

    # it does not hurt. 

    contains(S60_VERSION, 3.1) | contains(S60_VERSION, 3.2) | contains(S60_VERSION, 5.0) {

       DEFINES += SYMBIANSIM_BACKEND_USE_DELAY

    }