Hi did i buy the best sd card for phone?

it is 128 gb image mate pro uhs-i class 3 micro sd card with up to 170 mb/s read
i dont know much about sd cards and just bought this one because i need more app storage

One of the largest if you have an iPhone 7 or above

Ummm I don’t think you can put sd card in iphone

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The most important is to know what is the maximum gb that your phone allow you to use as external card

Class 3 usually means around 30mbps of r/w. Just fyi

Is that good

Good for pics n apps, 4k videos might lag a bit.