Some computers do not play nice with the adapters (none of mine will work with any adapter i own). Just put the 16g card into the phone, plug in the phone to the computer. It should pop up with a dialog box that shows two directories. One listed as phone and one as card. Copy everything in the card directory onto your computer desktop. Once everything is transferred turn off the phone, install the 32g card and turn the phone back on. As part of the mounting process (remember android is just a modified version of Linux) the phone will format it if necessary and then plug the phone into the computer and then just move the files back... You can then take the files on the desktop and archive them as backup of the phone external card. If you use text messing a lot you may also consider downloading a program called "SMS Backup & Restore" from the play store. It is free but does a great job. This will let you backup your text messages to the phone or the card. What ever you want. Good luck.