090 (Mobile)
090 is the oldest mobile phone number range. It is widely used by both individuals and corporations.
Regional Characteristics
The 090 prefix is the oldest mobile-phone numbering range, introduced when Japan moved mobile numbers to 11 digits in 1999. During the transition from the older 10-digit format (030, 080, 090, and others), many existing users were issued 090 numbers, so middle-aged and older subscribers - those who have kept the same number for a long time - are more strongly represented in this range. It is widely allocated to subscribers of the major carriers (NTT Docomo, au, SoftBank) and is the most universally recognized mobile prefix among individuals and businesses alike. As with 070 and 080, the prefix is national and not tied to any region.
Common Nuisance Call Patterns
Scammers impersonate a family member, claim to have "caused a traffic accident" or "misappropriated company funds," and demand settlement or restitution money. Because 090 numbers are often perceived as trustworthy, the prefix is sometimes weaponized for fraud.
An SMS saying "We tried to deliver your package but you were out" leads recipients to a fake site and steals personal data. Legitimate delivery firms almost never send links over SMS.
Scammers pose as city office or pension office staff and use the lure of "a refund" to direct victims to ATMs. Calls from mobile numbers claiming to be from public agencies are especially suspicious - always call back via the official number to verify.
Consumer Affairs Center
Frequently Asked Questions
Is a 090 number a mobile phone?
Yes - 090 is a mobile-phone prefix. It has been the longest-running mobile prefix since the 1999 move to 11 digits, and is widely used by both individuals and businesses.
I heard 090 is an older prefix - is it more trustworthy?
090 does tend to have many long-term users, but the age of the prefix doesn't directly equate to trustworthiness. Scammers also use 090 numbers, so it's important not to judge by the prefix alone - verify the caller.
Is the 090 prefix running out?
Available 090 numbers have been decreasing, but cancelled numbers are recycled after a waiting period. Growing demand has also been met by opening the 080 and 070 ranges.
Will my 090 number ever be changed to a 070 number?
Carriers do not unilaterally change your number. That said, if you switch carriers without using MNP (mobile number portability), the new number may end up being a 070 or 080 number.