The 512 GB variant of the iPhone Duo starts at $33.34/mo on T-Mobile via New Line over 36 months. Outright purchase pricing varies; see T-Mobile for the full quote.

Is 512 GB enough storage on the iPhone Duo?

512 GB is comfortable for most users — about 30,000 photos, ~50 high-quality apps with media, plus several hours of 4K video. Heavy ProRes / RAW shooters and offline-music collectors should consider 512 GB or higher; iPhone Duo doesn't expand via SD card.

How does the 512 GB tier compare to 256 GB on T-Mobile?

The 256 GB tier on T-Mobile typically runs a few dollars more per month than 512 GB on the same plan. Check the storage-tier table above for the live monthly delta.

Can I upgrade storage later on the iPhone Duo?

No — iPhone Duo doesn't support expandable storage, and Apple/Samsung don't offer post-purchase storage upgrades. Pick the tier that fits your two-year plan.

Does T-Mobile offer trade-in credit for the iPhone Duo 512 GB?

T-Mobile offers trade-in toward new iPhone Duo purchases — credit varies by your old phone's condition and any active promo. Higher storage tiers typically receive proportionally larger credits.