Storage
I bought iCloud storage of 200GB but still struggling to get space in my phone
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*You can not purchase extra storage for your phone, you can only purchase iCloud Storage.
You have purchased iCloud Storage which is Apple's cloud storage service, this does not add space to your phone.
To view and manage your iCloud storage go here
For example, you could save space on your phone by keeping low quality/resolution photos on your phone but keep the high-quality originals in iCloud. This would help you to save space on your device.
Take a look at this help article for more info Set up and use iCloud Photos – Apple Support