Final answer:
Resetting an iPhone using 'Erase all Contents and Settings' does not affect the storage capacity of the phone.
Step-by-step explanation:
When you reset an iPhone using 'Erase all Contents and Settings', it will not affect the storage capacity of the phone. The GB that was purchased on the phone is a hardware feature and is not dependent on the software settings.
Therefore, after resetting the phone, the 64GB storage capacity will remain.