Can you add memory to your storage space some way? And if so how do I go about doing it?
Can’t I buy more memory for my phone or not.
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You can not buy storage for your phone but you can buy iCloud Storage which means you can make storage space available on your iPhone, iPad or iPod touch when you use iCloud Photos and turn on Optimise Storage.Or you can remove content from your apps – like photos, music and podcasts – or delete the apps that you're not using.
Source and more Information at
About storage on your device and in iCloud – Apple Support