I NEED TO UPGRADE MY STORAGE
HOW DO YOU UPGRADE YOUR STORAGE SPACE
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*You can not purchase extra storage for your phone, you can only purchase iCloud Storage.
To view and manage your iCloud storage go here
This option answers your question and will allow you to upgrade your iCloud Storage. For each month you continue to subscribe and pay for this storage, you will continue to receive it.
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