Spark New Zealand (ASX:SPK, NZE:SPK) said the New Zealand Government's proposed changes to its policy approach for the renewal of spectrum in the 2300MHz and 2600MHz bands are not expected to have a "material" direct operations impact, according to a Wednesday filing with the Australian bourse.

However, the company expressed concerns that the decision introduces uncertainty for the telecommunications sector, the filing said.

The government's approach reduces the amount of spectrum the company can utilize to serve its customers and raises questions about access to essential bands, per the filing.

Spark New Zealand shares fell 1% in recent New Zealand trade.