All the SIM cards for visitors from outside of Japan can be categorized in two types:
Prepaid SIM or Rental SIM.
Most of them use the same network from NTT Docomo.
You can summarize major differences between Prepaid SIM or Rental SIM as the followings.
Prepaid SIM Card | Rental SIM Card | |
Activation | Required | Not Required |
APN | Required | Required |
Length of Stay | Short | Short to Long |
Data Speed | Low when crowded | Stable |
Return | Not required | Required |
Gurantee | No | Some has |
Source URL Differences Between Prepaid SIM Card and Rental SIM Card
Provider | Official Site |
LightPocket | Official Site |
CDJapan Rental | Official Site |
TRAVELTECH SIM | Official Site |
Sakura Mobile | Official Site |
Easygo Japan | Official Site |
GENKI MOBILE | Official Site |