King Charles communicated about the Duchy of Cornwall estate using a landline, but his son Prince William is using a speedier medium to the Royalty.

Prince William modernized a centuries-old royal tradition by integrating a millennial favorite into his role.

The Duchy of Cornwall published its Integrated Annual Report on July 24, offering insight into the financial performance of the estate managed by the Prince of Wales. William, aged 42, assumed stewardship of the estate when his father, King Charles, ascended the throne in September 2022. Established by King Edward III in 1337 to provide income for the heir, the estate is valued at over $1 billion.

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Prince William at the Royal Ascot at Ascot Racecourse on June 19, 2024. PHOTO: SAMIR HUSSEIN/WIREIMAGE

Despite its ancient origins, Prince William engages with matters concerning the Duchy of Cornwall using WhatsApp.

“The day after Her Late Majesty [Queen Elizabeth] died, I rang Prince William to say, ‘Welcome to your duchy, Sir.’ I obviously knew him, I’d been working with him for the previous eight years or 10 years to really explain to him what his future was during the time he was heir to the throne,” said Alastair Martin, outgoing secretary and keeper of the records, according to The Times.

Prince William, the Duke of Cornwall walks with Alastair Martin Secretary of Duchy of Cornwall, during a visit to the site where the Duchy of Cornwall's first ever housing project will be built, in Nansledan, on May 9, 2024 in Newquay, Cornwall, England

Alastair Martin (center) speaks with Prince William during a visit to the site where the Duchy of Cornwall’s first housing project will be built in Newquay on May 9, 2024. TOBY MELVILLE – WPA POOL/GETTY

 

“And he said, ‘I’m going to give you my mobile telephone number — if you want me, just get me, just message me,” Martin said. “And that’s how he works, and he is very involved.”

“There will be weekends when my WhatsApp messages will be in double figures, and I will be very responsive,” Martin continued. “If something has gone well or badly, I will want to tell my boss, and he’ll be straight back.”

The free app for text messaging and calls was the most popular social network among Internet users in the U.K. late last year, Statista reported, and Prince William’s proclivity for the speedy medium aligns with his generation. When King Charles was the heir and the Duke of Cornwall, he would connect with duchy management from a landline phone.

“Sustainability is a passion that they both share, but there are some differences,” Martin said about the father and son. “His Royal Highness, the 24th duke, would telephone me. His Royal Highness, the 25th Duke, will WhatsApp me.”

Prince Charles, Prince of Wales walks with Alastair Martin, Duchy of Cornwall Secretary & Keeper of the Records (L) and Michael Galsworthy (C) during a visit to Nansledan in Cornwall where he met local residents and unveiled a plaque for the development's new school on March 22, 2018 in Nansledan, England.

(From left) Alastair Martin, Michael Galsworthy and then-Prince Charles visit to Nansledan in Cornwall, England on March 22, 2018.  ANDREW MATTHEWS – WPA POOL/GETTY

Before becoming heir, Prince William spoke about his plans for the estate in the 2019 documentary Prince Charles: Inside The Duchy of Cornwall.

“I’ve started to think about how I will inherit the Duchy one day,” William told farmers. “Well, rest assured I’m not going to rock the boat; I’ll do much the same as what my father’s doing. I’m not so into the architecture — that’s the only thing.”

The Integrated Annual Report revealed that Prince William received $30 million from his first full year’s income from the Duchy of Cornwall estate. As a full-time working royal, the Prince of Wales doesn’t earn a traditional income; instead, his annual expenses are largely covered by the estate. The money goes towards the official, charitable and private expenditures of the heir to the throne, his wife Kate Middleton and their three kids, flowing from the Duchy of Cornwall spanning 130,000 acres across 23 counties in England and Wales and encompassing farmland, property and commercial businesses.

It’s understood that Prince William pays income tax on the entire income he receives from the duchy, minus household expenses, which have not been specified.

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The Prince breaks ground for the new facility during a visit to St. Mary’s Community Hospital where he is meeting staff and hear about a new integrated health and social care facility which is set to be built on adjacent land owned by the Duchy of Cornwall on May 10, 2024 in Isles of Scilly, England. BEN BIRCHALL-WPA POOL/GETTY

Soon after King Charles’ accession, a royal source told PEOPLE that Prince William was focused on making the most of his new royal role.

“He is going to very much take an active role in it. He is fully immersing himself in it,” the source said.

The Prince of Wales most recently made Duchy of Cornwall-related public engagements in May. During an overnight trip to the southwest of England, he visited the hub of the duchy’s innovative new housing initiative working to address homelessness in Newquay and broke ground for a new healthcare facility in the Isles of Scilly on land owned by the estate.