KDDI Mobile Account Number, Password & Contact Info

Contact Information for Cellphone Service ProvidersThis is a brief overview of KDDI Mobile and how to get the information you will need if you wish to port your phone number out to a different company. You can use the information below to get your KDDI Mobile account number and password.

KDDI Mobile Contact Info

Customer Service: 1-877-890-5001 | 1-888-533-4649
Hours: Monday – Friday: 9:00AM – 10:00PM (EST) | Saturday: 9:00AM – 6:00PM (EST) | Sunday: CLOSED

  • Sales: 1-866-348-3370
  • Dealer Support: N/A
  • Fraud: N/A
  • Insurance: N/A
  • Porting Department: N/A
  • Tech Support: 1-877-520-0800

Carrier(s) used by KDDI Mobile

  • (CDMA): ?
  • (GSM-A): ?
  • (GSM-T): ?
  • (PCS): ?
  • (Other): ?

KDDI Mobile Porting Instructions

See Notes

Notes: 1-888-533-4649 is KDDI America Customer Service, which is for Japanese-speaking customers. We were given a secondary number to call, which stated it was H2O Wireless. After navigating the automated system, our rep stayed on hold for 5 minutes to speak to a live “Customer Care Specialist,” who had no affiliation with KDDI America. We were not able to obtain information regarding KDDI America coverage in the USA or Porting instructions.

Please contact Best Cellular customer service if you need help or can’t find what you’re looking for in our list of United States mobile virtual network operators and wireless communications service providers.