Charles Taylor has been warned not to interfere in Liberian politics from his exile in Nigeria.
A power-sharing government is due to take over on Tuesday
Nigeria's President Olusegun Obasanjo told Liberia's ex-leader not to use his telephone to communicate outside the conditions of his asylum.
Last week, the United Nations warned that Mr Taylor was still trying "to influence events" in Liberia.
He went into exile as part of a deal which is due to see the creation of a power-sharing government on Tuesday.
Mr Obasanjo's spokeswoman Remi Oyo confirmed that the meeting had taken place late on Saturday night.
"The president advised Mr Taylor on the use of his telecommunications facilities, telephones and all that, so that he stays within the confines that govern his asylum in Nigeria," she said.
Mr Taylor's ally Moses Blah is due to hand over power to neutral businessman Gyude Bryant as the head of an administration comprising two rebels groups, Taylor loyalists and civilian opposition parties on 14 October.
The UN fears that "any interference from Mr Taylor could threaten the carefully constructed peace agreement."
Mr Taylor's spokesman, Vaanii Paasewe, told the AFP news agency that his "calls were not intended to undermine the peace process.
"We would have expected the incoming president to have wanted some advice, and we also had some ideas," he said.
Mr Taylor has been indicted for war crimes by a UN-backed court in Sierra Leone.
He is alleged to have backed the RUF rebels who killed and mutilated many thousands during that country's brutal 10-year conflict.
Nigeria does not have an extradition agreement with Sierra Leone but offered Mr Taylor exile in the south-eastern city of Calabar on condition that he stayed out of Liberian politics.
But as he left Liberia, he said: "God willing, I will be back."
The world's biggest peacekeeping operation is being sent to Liberia, but they have not yet ventured outside the relative calm of the capital, Monrovia.
Some 800 Bangladeshis are reinforcing the 3,500 West African troops already in place.
The UN force, Unmil, is due to reach its full strength of 15,000 by next March.