Seemed to work well at first.  Then, I noticed the phone started mounting/unmounting the card. When I tried to update some music files on the card, I think it has failed.  My computer can no longer see it in the phone when the two are connected.Okay - an update here. Since I posted the problem on Amazon I was contacted by Sandisk. I made one phone call, they took my information, e-mailed me a pre-paid UPS label, and I sent the card in. I couldn't believe it, but I think I had a new and improved card in about three days!  Yes, the first one lasted a little over twelve months, but the replacement was tendered no questions asked. Great service that can only be five stars.By the way, the replacement is working great!  I ordered a 64gb Sandisk microSDHC Card as well!