How can I increase my storage capacity

Do you mean the storage capacity on your iPhone or on iCloud?

For the former, you can't. The only way to increase the storage capacity of your iPhone is to get another iPhone that already has greater capacity. There is no way to upgrade the existing phone storage.

For iCloud, see this support article: Manage your iCloud storage - Apple Support

If you're referring to an iPhone's internal storage, you can't.

If you're referring to iCloud storage, click here and follow the instructions.

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Can someone please tell me how to upgrade my device storage ? Is there a way I can pay for more storage ? Not iCloud storage , but DEVICE STORAGE pls