Last summer, Sprint was the laughing stock of the major US carriers in terms of customer service. Fast forward 15 months, and the very same carrier is now sitting atop the pile. A recent report compiled by Pali Research has found that Sprint's wireless customer care response times were best in class, and just 2.5 years ago in its first survey, Sprint was dead last. The carrier answered a whopping 91% of calls that researchers placed to the care center in under 30 seconds, while 99% of calls were answered within 2 minutes. If you're curious how the other guys did, try this: Verizon grabbed the silver with 85%, T-Mobile followed with 43% and AT&T took home the award of shame with just 33% of test calls answered within half a minute. So, the real question is: have you Sprint customers noticed an uptick in service levels? And are you AT&T subscribers growing increasingly impatient?