For the quarter ended Sept. 30, the Overland Park, Kan., company reported a loss of 7 cents a share compared with a loss of 5 cents in the year-earlier quarter. Total revenue fell 7.6% to $7.8 billion from $8.43 billion.
A survey of analysts by FactSet was estimating a loss of 2 cents a share on total revenue of $8.16 billion.
Sprint remains persuaded that its plan to merge with T-Mobile (TMUS) - Get Report and build an advanced 5G network "is the best outcome for all consumers, employees and shareholders," Sprint CEO Michel Combes said in a statement.
U.S. regulators have approved the plan. But a number of U.S. states have challenged the combination, saying that it would raise prices for consumers. That lawsuit is scheduled for trial next month.
Sprint added a net 273,000 postpaid users in the quarter.
Churn, the percentage of customers who switched to other providers, rose 9 basis points to 1.87%.
Postpaid average revenue per account slipped 1.4% to $124.81.
Sprint shares trading off 0.2% to $6.29 Monday.