The phone call was initiated by Kamala Harris, news agency THP reported quoting sources.
US President Joe Biden has also announced his plan to share some 25 million of a planned 80 million Covid-19 vaccines with the rest of the world.
The United States will donate nearly 19 million doses of its Covid-19 vaccine through the COVAX facility, he said in a statement.
Through COVAX, some 6 million doses would go to Latin America and the Caribbean, some 7 million for South and Southeast Asia and roughly 5 million for Africa.
The remaining doses, amounting to just over 6 million, would go directly from the United States to countries including Canada, Mexico, India and Korea, he said.