Telecommunications company Spark's full-year profit has jumped 91 percent to $499 million, due largely to one-off gains related to the sale of data-centre assets.

Adjusted net profit came in at $225 million, 0.9 percent down on a year earlier. Adjusted revenue was broadly unchanged at $3.7 billion.

Reported EBITDAI - or underlying operating profit - increased 23 percent to $1.295 billion, but when adjusted for one-off items, it fell 2.4 percent to $1.035 billion.

Mobile revenue increased 4.4 percent to $1.52 billion, while mobile service revenue rose 1.1 percent to $998 million.

Last month, Spark announced a re-organisation of its operations into two divisions, as it sharpened its focus on core services.

The connectivity division will encompass the company's core telecommunications and IT services businesses, while the digital services division will oversee its digital and technology-related operations.

Spark also announced a review of activities it considered outside its core operations, including cloud and IT services, which now sit within the digital services division.

The company said the review would assess how to maximise value and returns for shareholders, and was expected to be completed during the first half of FY27.

Chief executive Jolie Hodson said the result reflected strong execution in the areas that mattered most to customers.

"Our focus this year was on turning the SPK-30 strategy into better outcomes for our customers and measurable performance improvements for our shareholders," Hodson said.

Hodson said returning to growth in underlying operating earnings remained a key focus.

"We are clear on what will deliver it - building on the healthy mobile growth we saw this year, embedding structural productivity improvements across our business, reducing our exposure to declining legacy products and further simplifying our portfolio."