Upgrade storage available in other apple device too?

I do hope you are no confusing iCloud storage, Nsreera, with the internal, hardware storage on your individual devices.

iCloud storage can be increased, or even decreased.

iCloud storage is shared with all devices using the same Apple ID.

The internal, hardware storage of your individual iDevices cannot be increased past their original manufacture.

Any iCloud storage, either the free 5GB or paid-for extended plan is available to all devices that are set up using that same AppleID

Yes that is what I said, all devices set up with the same AppleID as the icloud plan can use the storage.