Mobile phone service giant NTT DoCoMo Inc. is planning to tie up with Mizuho Bank to enable mobile phone subscribers to wire money to another subscriber without having to know the payee's bank account number, industry sources said Wednesday.

DoCoMo customers will only be required to put the cell phone number of the payee into their mobile phone and the payee will be required to specify bank accounts to which Mizuho Bank will transfer the money, the sources said.

Money wired in this way will be billed along with phone charges.

DoCoMo may launch the service as early as this summer, if the Financial Services Agency gives approval in time, they said.

KDDI Corp. offers a similar remittance service but requires customers to open accounts with a designated bank.