Storage space
Can I buy more storage space?
iPhone 11 Pro Max, iOS 14
Question marked as
1.
If you are talking about iCloud+ storage, then yes, see this Apple article: Upgrade to iCloud+
Upgrade to iCloud+ - Apple Support
See also: iCloud+ plans and pricing
iCloud+ plans and pricing - Apple Support
If you have upgraded iCloud storage, it would take about 1 to 3 business days in order to process.
Once your request for iCloud+ has been activated, you should receive an invoice in your email box.
If you have an iCloud subscription, you will receive a monthly bill from Apple, check your email box.
2.
If you are talking about iPhone device storage, then no.
But you can try to free up iPhone device storage, see this Apple articles below:
If you need more space for an update on your iPhone, iPad, or iPod touch
If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support
How to check the storage on your iPhone, iPad and iPod touch
How to check the storage on your iPhone, iPad and iPod touch – Apple Support (UK)
Clear Other storage on your iPhone or iPad
Clear Other storage on your iPhone or iPad - Apple Support
-> What's the difference between device storage and iCloud storage?
What's the difference between device storage and iCloud storage? - Apple Support