I don't find the XDJ-R1 on the mobile device's SSID selection screen.

-Is the XDJ-R1 set to "OFF"? Set it to [ENABLE] at [UTILITY] -[WLAN SETTING] - [MODE].
-Some time is required for the wireless connection to be established directly after the XDJ-R1’s power is turned on. Wait awhile.
-If there is another wireless LAN router, a microwave oven, wireless mouse, wireless headphones, cordless telephone, etc., (a device using the same 2.4 GHz frequency band) in the room, try moving this unit and the mobile device away from such devices.
-If large amounts of data are being transferred by wireless connection nearby (for example for high picture quality net video playback), try stopping data transfer.