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Smartphone

Can apps be played from an SD card ?
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Yes, you can install and use apps installed on the SD card.
State your Smartphone model if you need further assistance.
As stated by Michael yes.  This link gives you a really nice free app to move them there and walks you through the process.  This should let you run any app off the Sd

http://androidforums.com/threads/is-there-a-way-to-run-all-apps-off-sd-card-solved.515546/

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Commented:
The phone is a Samsung S4. Strangely, transferred an app to SD Card and then the app doesn't seem to show on the phone anymore and some apps transferred appear to be greyed out !!!
Commented:
If transferred successfully, AND they're greyed out, your SD card is currently not detected properly (you either removed it, or the SD card/reader is defect).