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Help selecing sim card

You're confusing a SIM card with a microSD card. A SIM is supplied by your carrier and its primary purpose is to enable your phone to use that carrier's cellular service. A microSD card is a storage medium. You need to search on Amazon for a 'microSD card'.
Your phone is apparently able to use up a 64GB card so while you 'might' be able to use a larger capacity card without any problems, just keep in mind that you're using an out-of-spec card.
Samsung specs:
https://www.samsung.com/uk/smartphones/galaxy-core-prime-g360f/SM-G360FHAABTU/
gsmarena specs:
https://www.gsmarena.com/samsung_galaxy_core_prime-6716.php
 
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That will work in your phone, provided it's formatted as FAT32 (Which it probably is). If you put it in your phone and it doesn't recognize it, try going to settings>storage and see if it will let you format it in the phone. Be careful, though, /sdcard is your internal storage. Do not format that.

BTW, adding an SD card isn't going to fix your storage issue unless you have a lot of media to move to the SD card. And, depending on the version of Android you've got, you may not be able to store apps on the SD card.
 
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"adding an SD card isn't going to fix your storage issue unless you have a lot of media to move to the SD card. And, depending on the version of Android you've got, you may not be able to store apps on the SD card."

This could be a problem for me. I only have 130 megs of actual videos & pics. The rest is apps.

I have 8 gigs. Miscellaneous files take up 4.58, and are a bunch of stuff I haven't heard of before. Could I just delete these?

My biggest files in that category are .sword with 29 megs, NPUSH with 22 megs, and .youversion with 16 megs.
 
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I'm afraid there's not a whole lot you can do with an SD card, unless you're willing to root your phone. Even so, the Core Prime was a budget phone with budget spec's 4 years ago when it was released. It really can't handle many of the current apps.

I wouldn't start deleting files that you don't recognize. You can cause some serious problems if you delete the wrong thing. I'd first look at your app caches. You'd be surprised how much storage a cache can use over time. Google maps, for instance, especially if you use GPS directions frequently. You can clear those caches to free up space so you can update apps. Keep in mind that these caches will bloat up again over time so it's only a stop-gap measure.

To be honest, what you need is a better phone.
 
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