HANOI (Reuters) - A private-equity arm of Standard Chartered Plc (>> Standard Chartered PLC) and Goldman Sachs (>> Goldman Sachs Group Inc) have invested a combined $28 million (19.7 million pounds) in Vietnamese startup M_Service, the operator of mobile e-wallet MoMo, the companies said in a joint statement on Thursday.

Standard Chartered Private Equity (SCPE) invested $25 million, while Goldman Sachs, an existing shareholder and strategic investor, put in an additional $3 million on top of its initial $5.75 million investment in 2013, M_Service said.

Smartphone app MoMo provides e-wallet service and over-the-counter remittance and payment platform for a customer base of 2.5 million people, the statement said. It has more than 1 million mobile e-wallet customers.

More than half of Vietnam's 90 million population are Internet users as of last year, while the number of mobile phone subscribers in Vietnam grew 26 percent to 124 million during 2009-2013, data from the government showed.

Official data on smartphone users are not provided but Apple Inc (>> Apple Inc.) last year opened a subsidiary in Vietnam, allowing the maker of iPhones to import and distribute cellphones directly in one of the fastest growing smartphone markets in the Asia-Pacific.

"It is extremely exciting to support MoMo's broader mission of promoting financial inclusion across Vietnam," said Bert Kwan, Head of ASEAN at SCPE, who will join MoMo's board.

(Reporting by Mai Nguyen; Editing by Gopakumar Warrier)

Stocks treated in this article : Apple Inc., Goldman Sachs Group Inc, Standard Chartered PLC