Netherlands-based BelCash is offering a technology called helloCash, while MOSS ICT, mainly owned by an Ireland-based firm, is rolling out M-Birr in the nation of 96 million people.
In both cases, Ethiopian banks and institutions will offer the service to customers and hold the cash deposited, in line with government policy that bars foreign firms or banks from investing in the financial sector or the telecoms industry.
"One of the things that the government wants to do is ensure there is financial inclusion," said MOSS ICT deputy general manager Kidist Negeye, adding M-Birr would help reach rural areas.
"Another aspect is the mobilization of domestic savings. The government wants to increase the number of deposits."
The central bank approved the roll out for M-Birr, which will be offered by five micro finance firms, in December.
It already has 5,000 to 6,000 users and expects to add 13,000 in February.
Kidist said the potential was "in the millions."
BelCash's helloCash service could have 2-3 million users this year and 10 million by 2017 or 2018, the firm's chief executive Vince Diop said, adding that BelCash would receive a fee for each transaction made.
Two of Ethiopia's 16 private banks, Lion International Bank and Cooperative Bank of Oromia, as well as a microfinance firm, have signed up for helloCash.
Two more banks have yet to submit applications to the central bank, he said.
The pilot project was under way and commercial services should start in about two months, Diop said.
Bankers say Ethiopia has no more than 1,500 ATM cash machines, while there was just over 2,200 bank branches as of June, or one for every 40,000 people, the central bank says.
Only one in 10 people have a bank account.
In addition to branches, which are expensive to set up, banks plan to authorise thousands of agents, such as shops or merchants, in line with new regulations.
Such agents will be able to take deposits and hand out cash via the mobile system.
Ethiopia's initiative mirrors the model pioneered in Kenya, where there are now 27 million users in the nation of 45 million.
Safaricom, a unit of Britain's Vodafone, was first with such a service, launched in 2007.