Apparently fed up with too many complaints received from customers, Sprint decided to sack its contract with customers who called their customer service hotline excessively and sent them letters notifying them that their subscription had been terminated. Part of the letter reads:

Our records indicate that over the past year, we have received frequent calls from you regarding your billing or other general account information. While we have worked to resolve your issues and questions to the best of our ability, the number of inquiries you have made to us during this time has led us to determine that we are unable to meet your current wireless needs.