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Yes, storage changes what your iPhone is worth: each step up adds value, and the largest tiers on Pro models carry the biggest premiums because fewer of them exist. Storage still matters less than the model itself, but within one model it is often the second-biggest factor.
How do storage tiers compare?
| Storage | Typical effect |
|---|---|
| 64GB / 128GB | Base value for the model |
| 256GB | Moderate increase |
| 512GB | Larger increase |
| 1TB / 2TB | Biggest premium, on Pro models |
How do I check my storage?
Settings > General > About > Capacity. Ignore "Available"; Capacity is the size you choose in the quote.
Why does storage matter more on newer phones?
Buyers of recent Pro models shoot 4K and ProRes video and keep large photo libraries, so they pay more for space. On older budget phones, battery and condition matter more.
Does storage you are using affect the price?
No. The phone is erased before resale, so only total capacity counts.
See every storage option on your model page from the sell iPhone hub, or read resale value by model.