I recently added the SyncUP & Drive device to my account - we are long-time T-Mobile customers and have not had any problems whatsoever besides this to date. My son was getting his license and I wanted to be able to monitor his driving. The SyncUP device worked like a charm for the first week or two, until the battery started dying nearly every night. This battery had been replaced less than 6 months prior, so there should not have been an issue. I was going on a trip, so I decided to let him drive my SUV while I was out of town since he was having problems with the battery and I wanted him in a more reliable vehicle. I also have a new battery in my vehicle, about one year old and also had my alternator replaced between 2-3 years ago. Well, when I was on my trip my battery started dying and then after a couple of days my son had the vehicle completely stall on him while driving. This device not only killed my battery, but my alternator! Fortunately, the batteries were both still under warranty but my alternator cost me a pretty penny. These devices sound absolutely amazing for teen drivers but they are most definitely too good to be true!
Best answer by tmo_amandaView original