More and more phones and tablets now come with support for microSD, but we're a long way off from being in a situation in which all do. You're not necessarily stuck with what you've got, though. Here's how to add storage to a Android phone or Android tablet that doesn't natively support microSD. Also see Android Advisor.
There are three main ways to add storage to your phone or tablet when microSD is not an option.
Add microSD support to your phone or tablet with a USB OTG hub
We love Inateck's HB3001Gthree-port USB 2.0 OTG (on the go) hub and card reader, which costs just £12.99 at Amazon. It's a wired solution (wireless alternatives are available but more expensive), with a built-in Micro-USB cable to attach it to your Android phone or tablet, which must support OTG.
Inateck's HB3001G has three USB 2.0 ports, plus card slots for microSDHC, TF, MS and M2. You can simultaneously use all available inputs if required, although with high-powered devices attached to the hub you will also need to plug it into a USB charger using the supplied power cable.
This means you can save films, pictures, music, documents and more on various removable storage, including USB flash drives and memory cards, and you can even attach cameras, hard drives, mice and keyboards. With these devices hooked up to your phone via the USB OTG hub, you can then use a file browser app to examine the connected drives and select and view your files.
If you have several microSD cards tucked away containing media files, using a USB OTG hub may also take some of the pain out of having to constantly open up the phone to swap them out.
Add storage to your phone or tablet with a wireless hard drive
While 32GB phones and tablets are becoming more common, 16GB is still the standard for Android. And with the OS taking up a fair few gigs on its own, never mind the bloatware preinstalled by the manufacturer, it doesn't leave a lot of room for your music, movies, photos and apps.
A huge benefit of using an operating system built by Google is free access to its very good cloud-storage services. And if you're worried about storing files in the cloud just in case the company goes bust and your stuff goes AWOL, be reassured that Google has little to fear on that front.