Is my Samsung Galaxy S23 Ultra original?
Short answer: A real Samsung Galaxy S23 Ultra has the Qualcomm Snapdragon 8 Gen 2 for Galaxy, 8 or 12 GB of RAM, 256 GB, 512 GB or 1 TB of storage, a 6.8-inch AMOLED screen (1440 x 3088, up to 120 Hz) and a 5000 mAh battery. Its model code is SM-S918B, SM-S918N, SM-S918Q, SM-S918U, SM-S918U1, SM-S918W, SM-S9180 (and other SM-S918... versions). A copy can show the right name, but it cannot change the processor, the real storage or the screen.
Real Samsung Galaxy S23 Ultra specs
- Processor
- Qualcomm Snapdragon 8 Gen 2 for Galaxy (4 nm)
- Memory (RAM)
- 8 or 12 GB
- Storage
- 256 GB, 512 GB or 1 TB
- Screen
- 6.8-inch Dynamic AMOLED 2X, 1440 x 3088 pixels
- Refresh rate
- up to 120 Hz
- Battery
- 5000 mAh
- Back cameras
- 200 MP main + 12 MP ultra-wide + 10 MP zoom + 10 MP zoom
- Front camera
- 12 MP main
- Fingerprint reader
- Under the screen (ultrasonic)
- Headphone jack
- No
- NFC
- Yes
- Model code
- SM-S918B, SM-S918N, SM-S918Q, SM-S918U, SM-S918U1, SM-S918W, SM-S9180 (and other SM-S918... versions)
How to check a used Samsung Galaxy S23 Ultra
- Read the model code. Open Settings, About phone, Model number. It must say SM-S918B, SM-S918N, SM-S918Q, SM-S918U, SM-S918U1, SM-S918W, SM-S9180 (and other SM-S918... versions). Copies often copy this name too, so this is only the first check.
- Check the processor. It must be the Qualcomm Snapdragon 8 Gen 2 for Galaxy. Copies run on a cheaper chip and sometimes rename it, so look at the number of cores and the graphics chip too. The Knowfone app does this for you and compares every part with this exact model.
- Do the black screen test. The real Samsung Galaxy S23 Ultra has an AMOLED screen: open the black colour of the screen test in a dark room. It must be completely black. A grey glow means an LCD, which this model never had.
- Measure the refresh rate. Set Settings, Display to the highest refresh rate, then run the refresh rate test with a finger moving on the screen. The real phone reaches about 120 Hz.
- Prove the storage. Settings shows 256 GB, 512 GB or 1 TB on a real Samsung Galaxy S23 Ultra. Copies can show any number; only writing data and reading it back proves the real size (how to check fake storage).
- Check the battery. The real battery holds 5000 mAh when new. See how to check battery health.
- Test the rest. Dial *#0*#: on many Galaxy phones it opens a test menu for the screen colours, touch grid, speaker, vibration and sensors (some versions block it). Samsung Members, Phone diagnostics, is the official alternative.
Knowfone checks a used Samsung Galaxy S23 Ultra against these exact specs in about 7 minutes: the processor, memory, storage, screen and cameras, then every other part, and answers: good to buy, buy only at a lower price, or don't buy. Free for Android.
Questions
What processor does the Samsung Galaxy S23 Ultra have?
The Samsung Galaxy S23 Ultra uses the Qualcomm Snapdragon 8 Gen 2 for Galaxy. A phone sold as a Samsung Galaxy S23 Ultra with a different processor is not one.
How much RAM and storage does the Samsung Galaxy S23 Ultra have?
The Samsung Galaxy S23 Ultra comes with 8 or 12 GB of RAM and 256 GB, 512 GB or 1 TB of storage.
What is the model number of the Samsung Galaxy S23 Ultra?
The Samsung Galaxy S23 Ultra reports the model code SM-S918B, SM-S918N, SM-S918Q, SM-S918U, SM-S918U1, SM-S918W, SM-S9180 (and other SM-S918... versions). You find it in Settings, About phone, Model number. Copies often copy this name too, so check the processor and storage as well.
Does the Samsung Galaxy S23 Ultra have an AMOLED screen?
Yes. The Samsung Galaxy S23 Ultra has a 6.8-inch AMOLED screen that runs at up to 120 Hz. In a dark room a black picture looks completely black on it.
More Samsung phones
Also read how to check any Samsung phone.
Sources:
- Wikipedia, Samsung Galaxy S23 series, checked 2026-10-09
- Google Play supported devices list (Build.MODEL and Build.DEVICE per marketing name), checked 2026-10-09