Gave it 4 stars because I don't know if the problem is the card or the phone.  I have an intermittant problem where the phone stops recognizing it.  But it's fast, and holds a lot.  I would recommend it.Update:  Had intermittant issues with my phone (galaxy s3).  Finally gave up the ghost completely, computer won't recognize it at all.  I don't think I had any important data on it.  I would take it up with SanDisk, as another reviewer indicated that they replaced his over issues in his phone, but my computer can't even recognize it to wipe it so I'm not sending it anywhere.