Delivery Reports
Unfortunately, delivery reports from Japanese numbers are unreliable and can be fake.
URLs
You cannot send URLs in your messages. Messages that contain a weblink are classified as illegal and are either discarded or will be removed as illegal text.
Operator-Specific Restrictions
DoCoMo – A maximum of 160 bytes/160 standard characters per SMS applies
Softbank – A maximum of 160 bytes/160 standard characters per SMS applies
KDDI – A maximum of 100 bytes/100 standard characters per SMS applies