Nextel Partners (NXTP) rose in early trading after the company said third-quarter numbers look strong.The wireless service affiliate of Nextel says preliminary results show sales of $445.2 million and an average revenue per user, or ARPU, of $69 for the quarter ended Sept. 30. Those numbers compare with $410.4 million in sales and an ARPU of $68 in the prior quarter. Analysts were looking for sales of $449.8 million for the third quarter, according to Reuters Research. Nextel Partners added 107,200 net new subscribers in the third quarter and ended with 1.9 million customers. The company managed to hold its monthly user defection rate, or churn, to 1.3% in the quarter, flat from the prior period. Shareholders of Nextel Partners are expected to vote Monday on a so-called put option that requires Sprint Nextel ( S) to buy the wireless telco. A majority vote in favor of the buyout will start an appraisal process to determine the fair market value that Sprint must pay for the affiliate. After a negotiated deal broke down this summer, Sprint began pushing for the appraisal process in August. Both companies, however, still deny there were ever any deal discussions. Nextel Partners is scheduled to post its third-quarter earnings report Oct. 27. The company's shares rose 23 cents to $24.85 Tuesday morning.