President Trump said Friday that he gave North Korean dictator Kim Jong Un a "very direct number" to call him when they met Tuesday in Singapore.

"I gave him a very direct number. He can now call me if he has any difficulty," Trump told reporters outside the White House.

Trump indicated he has similar access to Kim.

"I can now call him. I can now say, well, we have a problem," Trump said during a gaggle with reporters north of the West Wing.

It's unclear what number Trump provided. Even some of Trump's closest allies, reportedly including Fox News anchor Sean Hannity, dial the White House switchboard's publicly listed number before an operator connects them to Trump.

Trump has at least two publicly known government-issued cellphones, though he reportedly bristles at routine security updates, finding them " too inconvenient."

Trump uses two government iPhones, Politico reported last month — one for tweets and another for calls. The phone number for his calls-capable cellphone periodically changes, Politico reported. It reportedly has a camera and microphone, which worries some security professionals, though its GPS-tracking function is disabled.

It's unclear if Trump still uses a personal, non-government-issued cellphone, or if he provided Kim the number for a secure line maintained by aides.

A White House spokeswoman did not respond to a request for additional information.

Trump spoke to reporters after appearing on Fox News, and defended his meeting with Kim, which produced a short document outlining future steps at improving relations, including denuclearization.

"More importantly than the document, I have a good relationship with Kim Jong Un," Trump said. "That's a very important thing. ... I can call him. We have communication. It's a very good thing."