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, you’re out of luck. Fortunately, some of the best Android smartphones and tablets do support them.

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It’s best to fully understand how to use a microSD in order to get the most out of it. 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.

Speed Class ratings

You’ll probably come across a slew of number-symbol combinations printed on cards and their packaging. These are Speed Class indicators that refer to a microSD card’s minimum sustained write speed. Write speed tells you how quickly data can be saved to the card and is expressed in megabytes per second (MBps). It’s useful to keep in mind when shopping for certain use cases like video recording. There are currently three classes: Speed Class, Ultra High Speed (UHS) Speed Class, and Video Speed Class. The original Speed Class is denoted by the write speed enclosed in a large “C,” while UHS Speed Class is shown with a Class number inside a large “U.” The mark for Video Speed Class is a stylized “V” followed by the write speed. Here’s how the minimum speeds for the different classes break down.

Class Minimum write speed
2 2 MBps
4 4 MBps
6 6 MBps
8 8 MBps
10 10 MBps
UHS 1 10 MBps
UHS 3 30 MBps
V6 6 MBps
V10 10 MBps
V30 30 MBps
V60 60 MBps
V90 90 MBps

Most reputable microSD cards these days will have at least a Class 10 rating for write speeds. These are just minimum requirements, and many cards are capable of faster speeds than their rating. A Class 10 card may offer 95 MBps, for example. Read or transfer speeds are likely to be respectable — around 100MBps — across many options as well.

Application Performance Class

The SD Association also has a standard called Application 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.”

Choosing a microSD card for your needs

If you are simply focused on adding storage space for downloaded files and casual pictures and videos, the lower Speed Class ratings will do just fine for your phone or tablet. Content creators shooting a lot of video will want to look for higher-end Class 10 and UHS microSD cards, at the very least. These will be better equipped to handle 4K resolutions and high frame rates of 60 frames per second or 120 fps. Android power users may want to consider cards with the App Performance Class designation.

In any case, 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.

The best microSD cards for your smartphone or tablet

We’ve picked out five of the best microSD cards for smartphones, from casual to professional use. 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

32 gigabyte SanDisk microSD card and SD card adapter
SanDisk

Here’s a speedy SDHC card that offers read speeds of up to 100 MBps and write speeds of up to 60 MBps. This is a durable card with a lifetime warranty in most regions, 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 UHS Speed Class 3, V30, and A1 for Adoptable Storage. It also comes with a handy SD adapter.

Samsung Evo Plus 64GB

64 gigabyte Samsung microSD card and SD card adapter
Samsung

This SDXC card is rated as UHS 3 and offers transfer speeds of up to 100 MBps. 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 gigabyte Lexar microSD card and SD card adapter
Lexar

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 3 rating offering read speeds up to 270 MBps. It can also handle 4K video recording with a minimum sustained write speed of 90 MBps. This is another card with a lot of good reviews, and it’s ideal if you record a lot of video on your mobile device.

Kingston Canvas Select Plus 256GB

256 gigabyte Kingston microSD card and SD card adapter
Kingston

This UHS 3 card is A1 rated, so it’s optimized for use in 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 MBps, but write speeds are slower, so it’s not a great card for recording 4K video. It comes with an SD adapter.

SanDisk Extreme 1TB

1 terabyte SanDisk microSD card
SanDisk

The 1TB option from the Sandisk Extreme line is the ultimate expanded storage choice. UHS 3 and V30 Speed Class ratings mean it’s well placed to handle 4K video recording. Read speeds go up to 160 MBps, with write speeds going up to 90 MBps. You’ll want to ensure your device is fully compatible to maximize that potential performance. It’s also A2 rated as one of the best Android storage options out there.

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