I returned mine one week after I got it due to slow 3G speeds. Sprint is now trying to charge me for one month of service plus the $36 activation fee. So about $122 for one week of service. When I've had to return another smartphone in the past(to Sprint and Verizon), they've only charged me for the time I had the phone and I haven't had to pay the activation fee. Has this happened to anyone else with Sprint and other carriers?