Works in my S3, S4 and S5. Another option is the Samsung micro SD card. The biggest thing to make sure when buying for your S4 is that it's Micro SD, and not bigger than 64gb. The HC part stands for High Capacity which the S4 is able to handle up to 64gb. One more thing to keep in mind is the speed. If you're going to be taking HD videos and pictures with your S4, make sure the speed is higher. If it's just for music and games, you can get away with a slower one. Hope this helps your future purchase.

yes you can.
if you are buying the 32GB. it will work with any gopro

Some memory cards have a Write Protect or Read Only switch which 'protect' the current contents of the card from being overwriten.

Yes. Class 10 is a higher speed rating, but it is backwards compatible. You just won't get the read/write times advertised for the class 10 product, you'll get the slower class 6 bandwidth instead.

In general, I buy the highest speed flash cards available, on the theory that I'll have the card a lot longer than the device, and I don't want to have to buy a new card when I buy a new device.

I use this card in my KDLINKS dash cam everyday. I leave my camera mounted in my truck even when I'm not in it. I live in S Florida and the high temps to not effect it.

Do not look at the color, look at the memory size and data transfer rate. A fast transfer rate will help if you have a quality camera in your cell phone and want to take pictures or video. It will also help you phones performance if you can store your apps on the card. always check on the performance of the card and the amount of data it can storage to judge the card.

IPhone does not use memory cards because it monopolize buyers to choose from the different built in memory the phone has on its different prizes. The more memory it has the more expensive the iphone becomes. Compared to the phones that uses memory card...at the minimum prize of the basic gigabyte that you buy and even if you add extra memory card for an additional cost, total cost will still run cheaper compored to iPhone.

No, you can't. This product is a Micro SD card, and you will need a normal sized SD card.

That depends on the camera rating ( 8mp - 14mp Megapixel ) and what resolution you use on the camera / phone. Some DSLR cameras can take up to 5megabyte file size picture files using the high resolution setting. Roughly you can use the following table at Sandisk to determine the capacity depending on your camera and settings. For example you should be able to store 15000 pictures that have roughly a 2 megabyte file size on this 32 gbyte card. You can see the file size you camera/phone is creating from the settings for the picture resolution generally. Or take a test picture and transfer to your home pc and look at the file size in Windows explorer or whatever Operations System file explorer you have for example.

http://kb.sandisk.com/app/answers/detail/a_id/69/~/number-of-pictures-that-can-be-stored-on-a-memory-device