W490 wont read memory card

Hi, sykko_one, I have the exact same phone and was experiencing the same problems. After about a year of using my phone and storing music, pictures, videos, etc. on my phone it would suddenly stop working. Sometimes it would work, and sometimes I wouldn't be able to save or read any data on the memory card. What I did to fix it was completely remove the memory card from the phone and used a micro sd Tinpec card reader, picture here. You want the one that supports micro sd. You can find them on ebay or amazon. Then connect your micro sd card to your pc with the adapter and right-click the removable drive (might be drive e: or f:) and choose format. Leave the default options and format the disk. Make sure you've selected the right disk. To verify this you can open the drive and look at the contents, it should have a folder called "moble." Go ahead and format the drive. Then use chkdsk.exe from the command line to check the disk for errors. Syntax will look like "chkdsk f: /f" or "chkdsk e: /f" (depending on the drive letter assigned to your sd card reader.)

If the format and chkdsk do not work. try just deleting all the information from the card and copying some pictures and music files to it. If these copy successfully then I would assume the problem is with the firmware on your phone. Take the phone to a t-Mobile store and see if they can't re-load the firmware. And don't worry about deleting any data from your sd card, it will not affect the phone in any way, it will just delete whatever pictures music files you have stored on the card. So be sure to back those up first before you do anything. Hope this helps. -Rogueelite