Samsung

Unlocked cell phones are compatible with GSM carrier such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint.
Please check if your GSM cellular carrier supports the bands for this model before purchasing, LTE may not be available in all areas: 3G HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100, 4G LTE band B1 (2,100), B2 (1,900), B3 (1,800), B4 (AWS), B5 (850), B7 (2,600), B8 (900), B12 (700), B13 (700), B17 (700), B20 (800), B28 (700), B66 (AWS-3)
This device may not include a US warranty as some manufacturers do not honor warranties for international items.

Unlocked cell phones are compatible with GSM carrier such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint.
Snapdragon Processor
Please check if your GSM cellular carrier supports the bands for this model before purchasing, LTE may not be available in all areas: 3G HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100, 4G LTE band B1 (2,100), B2 (1,900), B3 (1,800), B4 (AWS), B5 (850), B7 (2,600), B8 (900), B12 (700), B13 (700), B17 (700), B20 (800), B28 (700), B66 (AWS-3)

Make sure this fits by entering your model number.
Display: 5.7-inches
Camera: 13-MP

Dual Nano-SIM (4G + 4G) ; 3G WCDMA B1 / B2 / B4 / B5 / B8 ; 4G LTE B1 / B2 / B3 / B4 / B5 / B7 / B8 / B12 / B13 / B17 / B18 / B19 / B20 / B25 / B26 / B28 / B32 / B66 / B38 / B39 / B40 / B41 ; 4G LTE & 3G work with AT&T and T-Mobile ; DOES NOT work with Sprint, Verizon, U.S. Cellular and all other CDMA carriers ; LTE compatibility: This is international stock, varies per carrier (ensure to check with your carrier before purchase)
Octa-Core 2.7GHz + 1.7GHz CPU ; 512GB ROM, 8GB RAM, 4000 mAh battery.
Main Camera: Dual: 12 MP (f/1.5-2.4, 1/2.55″, 1.4µm, dual pixel PDAF, OIS) + 12MP (f/2.4, 1/3.4″, 1µm, AF, OIS) ; Front Camera: 8 MP, f/1.7, 1/3.6″, 1.22µm, AF, DIS.

Make sure this fits by entering your model number.
Display: 5.6-inches
Camera: 16-MP

3G HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 – 4G LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 32(1500), 38(2600), 39(1900), 40(2300), 41(2500), 66(1700/2100) – Hybrid Dual SIM (Nano-SIM, dual stand-by) > (ensure to check compatibility with your carrier before purchase).
6.1 inches QHD+ Dynamic AMOLED Infinity-O Display 1440 x 3040 pixels, 19:9 ratio (~550 ppi density) HDR10+ certified – Front/back glass (Gorilla Glass 6), aluminum frame – IP68 dust/water proof (up to 1.5m for 30 mins) > Not advised for beach or pool use – Android 9 (Pie).
64-bit Octa-Core Processor – Ultrasonic Fingerprint sensor – Non-removable Li-Ion 3400 mAh battery.

Hybrid/Dual-SIM (Nano-SIM), Network Compatibility : 2G bands: GSM 850 / 900 / 1800 / 1900, 3G bands: HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100, 4G LTE bands: 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 32(1500), 38(2600), 39(1900), 40(2300), 41(2500), 66(1700/2100)
6.4 inches, Dynamic AMOLED capacitive touchscreen, 16M colors, 1440 x 3040 pixels, Corning Gorilla Glass 6, 128GB Storage, 8GB RAM, Up to 512GB microSD Card slot (uses SIM 2 slot)
Android 9.0 (Pie), Exynos 9820 Octa (8 nm), Octa-core (2×2.73 GHz Mongoose M4 & 2×2.31 GHz Cortex-A75 & 4×1.95 GHz Cortex-A55), Mali-G76 MP12

Make sure this fits by entering your model number.
4.8 inch HD Super AMOLED Screen
1.5 GHz Dual Core Processor

Make sure this fits by entering your model number.
5.1-inch touchscreen display with a resolution of 1440 pixels by 2560 pixels at a PPI of 577 pixels per inch.
1.5GHz octa-core Samsung Exynos 7420 processor