Telstra is on track to meet its full-year earnings targets after lifting first-half profit by nearly nine per cent.

The telco giant on Thursday said its net profit rose to $1.597 billion in the six months to December 31, from $1.468 billion in the previous corresponding period.

The profit rise came on the back of strong growth in customer numbers which helped push revenue up 1.5 per cent to $12.6 billion.

Telstra added 607,000 new domestic customers and 321,000 international mobile customers during the first half.

Chief executive David Thodey confirmed the telco was on track to meet its full-year earnings targets of low single digit total income and earnings growth.

"We will continue to focus on improving customer satisfaction, growing customer numbers, simplifying the business and taking advantage of new growth opportunities," he said in a statement.

"We are making good progress but there is more to do."