0570 numbers are Navi Dial nationwide unified numbers by NTT Communications. Callers reach the same number from anywhere, paying charges: about 8.5 yen/3 min from landlines, 10 yen/20 sec from mobiles.
The critical caveat: 0570 calls are excluded from mobile "unlimited calling" plans. Many callers assume no charges apply, but 0570 is billed separately. Long call center wait times can generate unexpectedly high charges.
Companies use 0570 for single-number nationwide reception with automatic routing to the nearest branch. Unlike 0120 toll-free, companies don't bear call costs, reducing expenses.
To avoid 0570 charges, call the company's direct number with area code (03-XXXX-XXXX, etc.) listed on their website, which qualifies for unlimited plans. Searching "0570 alternative number" finds direct number directories. See Free Dial vs Navi Dial for details.