The Foreign Office says Johnson and Richard Ratcliffe spoke by phone today, but did not elaborate further.
Dual UK-Iranian citizen Nazanin Zaghari-Ratcliffe is serving a five-year sentence for plotting the "soft toppling" of Iran's government.
Earlier this month, Johnson told lawmakers that Zaghari- Ratcliffe was "teaching people journalism" when she was detained last year. Her family and employer insist she was simply visiting her family.
Today, Environment Secretary Michael Gove said "I don't know" when asked what Zaghari-Ratcliffe was doing in Iran.
Family and friends say the confusion has put Zaghari- Ratcliffe at risk of a longer prison sentence.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)