WASHINGTON, July 30 (Reuters) - Sprint Corp  
   S.N
    reported higher-than-expected second-quarter revenue on Wednesday, as the company expanded its high-speed coverage and came closer to completing a network upgrade that had caused a massive drop in its customer count.      The company, which is 80 percent owned by Japan's SoftBank Corp  
   9984.T
   , said it earned $23 million, or 1 cent a share, in the second quarter, following a loss of $1.6 billion, or 53 cents a share, a year earlier.      Revenue fell to $8.8 billion from $8.9 billion a year earlier, but beat the average analyst estimate of $8.7 billion according to Thomson Reuters I/B/E/S.        (Reporting by Marina Lopes; Editing by Bernadette Baum)  ((marina.lopes@thomsonreuters.com)(347 978-6395))  Keywords: SPRINT CORP RESULTS/