"I would like to inform you of a longstanding issue with Sprint and its phone known as the Samsung Moment. In short, if you use WiFi and then turn it off when done (leaving it on drains your battery very quickly, so turning it off is necessary), within a few minutes the EvDo and 1x/RTT data modems will lock up (for lack of a better term) and render your phone unable to send or receive any data at all. It has been shown that virtually every Samsung Moment sold is vulnerable to the data lockup. This defect is serious. The data lock prevents 911 service availability in emergencies. Users will not know the phone is locked out until a call is attempted thus hindering emergency contact. The only way to recover from the lockup is remove the battery, resulting in an unnecessary delay in what could be a life threatening situation.
As shown by feedback on a FaceBook(1) group dedicated to the lockup and Sprints own forums(2), Samsung/Sprint mass sold a defective phone to its customers and has neglected to fix the phone, recall the devices, issue functional replacements, or refunds.: