Galaxy S25 Ultra IMEI Check: SM-S938U and Lock Status
The same phone ships under several codes. Match yours to the seller's country, then see what 64 lookups showed.
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See device, blacklist and lock status in seconds — no signup. Dial *#06# on the phone to display its IMEI — or scan a photo or screenshot of that screen, or of the barcode on the phone's box or SIM tray.
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Code first, then the phone
Samsung released the Galaxy S25 Ultra in 2025. Its Samsung Galaxy S25 Ultra pages (read 10 November 2026) lists a 6.9-inch Dynamic AMOLED 2X display, a built-in S Pen, a Snapdragon 8 Elite processor, 12 GB of RAM, a 5,000 mAh battery and IP68 protection, in 256 GB, 512 GB and 1 TB. There is no microSD slot. The four core colours are Titanium Silverblue, Titanium Gray, Titanium Black and Titanium Whitesilver, with three more sold only on Samsung.com.
Samsung ships the same phone under different codes by market, and a code that does not fit the seller's country is the first thing to question. Read it under Settings, About phone; the Samsung IMEI guide shows the path.
| Code | Market | Checked on FullIMEI (90 days) |
|---|---|---|
| SM-S938U | United States | 30 devices |
| SM-S938B | International | 23 devices |
| SM-S938U1 | United States (U1 variant) | 11 devices |
The US build: lock readings
Counts are distinct handsets seen between 12 August and 10 November 2026. For SM-S938U:
| SM-S938U result | Devices | Share of 30 |
|---|---|---|
| Locked to a carrier we read | 17 | 57 % |
| Unknown (lock not readable for free) | 13 | 43 % |
| Unlocked | under 10 | - |
More than half read locked, and 19 of the 30 lookups were made in the United States. A nearly new Ultra for sale may still be on a carrier payment plan, so ask who holds the account. Compare T-Mobile's unlock tracks before agreeing a price.
The international build, mostly unknown
All 23 SM-S938B lookups returned unknown, and 18 came from Vietnam. That is expected: this code is sold unlocked outside the US, and our free lookup has no carrier source for it. A clean "unknown" here still leaves blacklist and ownership questions open.
Checks for a used S25 Ultra
- Dial *#06# and note the IMEI; compare it with Settings, About phone, Status information.
- Read the model code and match it to the seller's country.
- Confirm 6.9 inches and a built-in S Pen. No pen slot means another Galaxy.
- Run the IMEI here, then a blacklist check, and for US units a carrier lock check.
Specs are Samsung's; the counts are ours and cover only phones checked on this site.
Questions people ask
What does SM-S938U mean on a Galaxy S25 Ultra?
SM-S938 is the S25 Ultra family. The letter after the digits marks the market variant: U is the US build, B the international one. We count the codes separately because they are sold in different places.
How can I tell an S25 Ultra from an S24 Ultra?
By size and the model code. Samsung lists a 6.9-inch display for the S25 Ultra and 6.8 inches for the S24 Ultra, and the family codes are SM-S938 and SM-S928. See the <a href="/check/galaxy-s24-ultra">S24 Ultra page</a>.
What storage does the S25 Ultra come in?
Samsung lists 256 GB, 512 GB and 1 TB with 12 GB of RAM, and no microSD slot. A listing that mentions a memory card does not describe this phone.
Can the free check tell if a US S25 Ultra is locked?
Only for T-Mobile and Metro. Of 30 SM-S938U phones, 17 read locked and 13 returned unknown. Unlocked was under ten. Unknown means no lock was visible to us, not that the phone is free.
Why were so many lookups from Vietnam?
Of 23 phones with the international SM-S938B code, 18 were checked in Vietnam. We only see where a lookup is made, but it suggests that the international build is checked mainly by buyers and resellers there.