How to choose the best MicroSD cards for your smartphone or tablet

If you run out of storage space on your phone or tablet, you’ll definitely want to find a way to get more. One of the simplest options is to insert a MicroSD card. Sadly, not all smartphones and tablets support MicroSD cards. If you have an iPhone or iPad, then you’re out of luck, but many Android smartphones and tablets do support them.

To see if your device accepts them, check the full specs for your phone on the manufacturer’s website, or look for a MicroSD card slot in your phone. On newer phones, they’re generally part of the SIM tray.

What to consider when buying a MicroSD card

There are a handful of things to consider when you’re choosing a new MicroSD card for your phone. Obviously, the price and capacity are going to be factors, but you also need to make sure that the type of card you buy is supported by your device and that it’s suitable for your needs.

SDHC and SDXC

SDHC stands for Secure Digital High Capacity and SDXC stands for Secure Digital Extended Capacity. The only real difference is the range of data they can store. You’ll find that SDHC MicroSD cards range from 2GB to 32GB in size, while SDXC MicroSD cards can range from 32GB up to 2TB in size, though the biggest MicroSD card we’ve seen so far is 1TB.

Class and UHS ratings

The Class rating of a MicroSD card refers to its minimum transfer speed. UHS stands for Ultra High Speed. The new V class is for video. Here’s how the minimum speeds for different classes break down.

Class Minimum Speed
2 2 MB/s
4 4 MB/s
6 6 MB/s
8 8 MB/s
10 10 MB/s
UHS 1 10 MB/s
UHS 3 30 MB/s
V6 6 MB/s
V10 10 MB/s
V30 30 MB/s
V60 60 MB/s
V90 90 MB/s

Most MicroSD cards are a lot faster than the minimum speed. A Class 10 card may offer 95 MB/s, for example.

Application Performance Class

The SD Association also has a standard, called App Performance Class, which is designed to highlight MicroSD cards that are suitable for use in smartphones and tablets. The A1 rating means that the card can manage random read input-output access per second (IOPS) of 1,500 and write IOPS of 500. The A2 rating indicates random read input-output access per second of 4,000 and write IOPS of 2,000. This is ideal for quickly opening apps and processing tasks. These A1 and A2 cards are worth looking out for if you intend to format your card as internal storage in an Android device, something Google calls “Adoptable Storage.”

How to choose a MicroSD card

You’re obviously going to want the highest speed, highest capacity MicroSD card you can get, for the lowest price. We would advise you to factor in the brand reputation and the reported performance and reliability. Check out the warranty terms, just in case something should go wrong. You also need to be careful where you buy. If you’re going to use Amazon or eBay, then read some customer reviews and watch out for fake MicroSD cards, because they’re disappointingly common.

Best MicroSD cards for your smartphone or tablet

We’ve picked out four of the best MicroSD cards for smartphones here, but the right card for you will depend on your device and your needs. You may want to look beyond this list, but we advise you to stick to well-known brands like Samsung, Lexar, SanDisk, Toshiba, and Kingston. All prices are correct at the time of writing, but the MicroSD card market moves fast, so expect them to change.

SanDisk Extreme 32GB ($17)

SanDisk Extreme 32GB MicroSD Card

Here’s a speedy SDHC card that offers read speeds of up to 90 MB/s and write speeds of up to 60 MB/s. This is a durable card with a lifetime warranty, and the reviews are overwhelmingly positive. It will have no trouble with 1080p video and can even handle 4K, though you may want a larger capacity if that’s what you’re buying it for. It is certified Class 10, UHS 3, and V30. It also comes with a handy SD adapter.

Samsung Evo Plus 64GB ($24)

Samsung Evo+ 64GB MicroSD Card

This SDXC card is rated as Class 10 or UHS-1 and offers transfer speeds of up to 80 MB/s. It’s a durable and reliable MicroSD card with a lot of positive reviews. It’s fast and efficient for use in phones and tablets and won’t have any trouble recording 1080p video, but you should opt for another card if you shoot in 4K. Ultimately, it’s a great all-arounder for a reasonable price.

Lexar Professional 128GB ($128)

Lexar Professional 128GB MicroSD Card

If you want a fast MicroSD card with a decent capacity, then consider this option from Lexar. It’s an SDXC card with a UHS-II rating, offering read speeds up to 150 MB/s. The write speeds are a little disappointing at around 45 MB/s, but it can handle 4K video recording. This is another card with a lot of good reviews and it comes with a handy USB card reader to plug into your PC or laptop.

SanDisk Ultra 256GB ($60)

SanDisk Ultra MicroSD card

This Class 10 card is A1 rated, so it’s ideal for Android phones. It also offers a whopping 256GB at a reasonable price, and it’s fast enough for 1080p video recording. Read speeds go up to 100 MB/s, but write speeds are a lot lower, so it’s not a card for recording 4K video. It comes with an SD adapter.

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