To use VISITOR SIM your device needs to have the following 3 requirements.
Your device must be Unlocked (SIM Lock Free).
If you don't know if your device is unlocked or not, please ask the store where you purchased your device.
Your device must support one of the following frequency
LTE Band 1 (2100MHz), Band 19 (800MHz), Band 21 (1500MHz)
W-CDMA/HSDPA/HSUPA Band 1 (2100MHz), Band 19 (800MHz)
Your mobile phone carrier is NTT docomo's roaming partner or your device has type approval mark.
Check if your mobile phone carrier is NTT docomo's roaming partner ( You'll jump to docomo's page. Click the PDF link and find your mobile phone carrier)