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| Phone | Samsung Knack U310 | Samsung Galaxy S21 | ZTE Blade Max 3 / Max Blue | Samsung SGH-A727 | Samsung MM-A900 / SPH-A900 / Ace |
| Current U.S. Carriers | (none) | Verizon | (none) | (none) | (none) |
| Global Availability | Released | Released | Released | Released | Released |
| Specifications | |||||
|---|---|---|---|---|---|
| Display Size |
2.2" diag. 4 : 3 |
6.2" diag. 20 : 9 |
6" diag. 16 : 9 |
? | ? |
| Display Resolution & Type |
176 x 220 pixels (~128 ppi) LCD (TFT/TFD) |
1080 x 2400 pixels (~424 ppi) AMOLED |
1080 x 1920 pixels (~367 ppi) LCD (TFT/TFD) |
220 x 176 pixels LCD (TFT/TFD) |
240 x 320 pixels LCD (TFT/TFD) |
| Display Refresh | ? | 120 Hz | 60 Hz | ? | ? |
| Battery | 1,000 mAh | 4,000 mAh | 4,000 mAh | ? | ? |
| Processor | ? | 2.8 GHz Qualcomm Snapdragon 888 | 2 GHz Qualcomm Snapdragon 625 (MSM8953) | ? | ? |
| RAM | ? | 8 GB | 2 GB | ? | ? |
| Storage | ? raw hardware | 128 GB * | 16 GB | ? raw hardware | ? raw hardware |
| Main Camera | - | 12 megapixel | 13 megapixel | 1 megapixel | 1 megapixel |
| Wide Camera | - | 12 megapixel | - | - | - |
| Tele Camera | - | 64 megapixel | - | - | - |
| Video Capture | - | 8K | 4K UHD | QCIF (176 x 144) | ? |
| Front Camera | - | 10 megapixel | 5 megapixel | - | - |
| Weight |
3.63 oz (103g) |
6.03 oz (171g) |
6.34 oz (180g) |
2.82 oz (80g) |
3.9 oz (111g) |
| Dimensions |
3.78" x 2.01" x 0.74" (96 x 51 x 18.8 mm) |
5.97" x 2.8" x 0.31" (152 x 71 x 7.9 mm) |
6.49" x 3.3" x 0.35" (165 x 84 x 8.9 mm) |
4.51" x 2.01" x 0.35" (115 x 51 x 8.9 mm) |
3.86" x 2.01" x 0.57" (98 x 51 x 14.5 mm) |
| Form Factor | Clamshell | Slab | Slab | Slab | Clamshell |
| Platform / OS | (proprietary) | Android | Android | (proprietary) | (proprietary) |
| Network Bands |
CDMA: 850, 1900 |
5G: 2, 5, 12, 25, 30, 41, 66, 71, 77-C, 260, 261 4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 29, 30, 38, 39, 40, 41, 46, 48, 66, 71 WCDMA: 1, 2, 4, 5, 8 CDMA: 800, 850, 1900 GSM: 850, 900, 1800, 1900 |
4G LTE: 2, 4, 5, 12, 13, 25 WCDMA: 2, 4, 5 CDMA: 850, 1900 GSM: 850, 900, 1800, 1900 |
WCDMA: 2, 5 GSM: 850, 900, 1800, 1900 |
CDMA: 850, 1900 |
| Data Technology | - | NR (5G) | LTE (Cat 4) | HSDPA 1.8 | EVDO r0 |
| Features | |||||
| Barometer | - | Yes | - | - | - |
| Fingerprint Reader | - |
Yes in-display (ultrasonic) |
Yes stand-alone |
- | - |
| Flashlight | - | Yes | Yes | - | - |
| GPS / Location | Yes | n/a | n/a | - | Yes |
| Water-Resistant | - |
Yes IPX8 (SCUBA) |
- | - | - |
| Accessibility | |||||
| Adjustable Text Size | Yes | n/a | n/a | - | - |
| Hearing Aid Compatible |
Yes M4, T4 (very tele-coil compatible) |
Yes M3, T3 (mostly tele-coil compatible) |
Yes M4, T3 (mostly tele-coil compatible) |
- | - |
| Multiple Languages | Yes | n/a | n/a | Yes | Yes |
| TTY/TDD (Digital) | Yes | Yes | Yes | Yes | Yes |
| Alerts | |||||
| Extra Display | Yes | - | - | - | Yes |
| Ringer Profiles | - | - | - | Yes | - |
| Connectivity | |||||
| Bluetooth | - | Yes | Yes | Yes | Yes |
| NFC | - | Yes | - | - | - |
| USB | - |
Yes USB Type C |
Yes USB Type C |
Yes | Yes |
| Wi-Fi | - |
Yes 6 (802.11 a,ac,ax,b,g,n) |
Yes 5 (802.11 ac,b,g,n) |
- | - |
| Contacts | |||||
| Picture ID | - | n/a | n/a | Yes | Yes |
| Ringer ID | - | n/a | n/a | Yes | Yes |
| Voice Dialing | Yes | n/a | n/a | - | Yes |
| Customization | |||||
| Custom Graphics | - | n/a | n/a | Yes | Yes |
| Custom Ringtones | - | n/a | n/a | Yes | Yes |
| Real-Music Ringers | - | n/a | n/a | Yes | - |
| Data & Network | |||||
| Data Tethering | - | n/a | n/a | Yes | Yes |
| WAP / Web Browser | - | n/a | n/a | Yes | Yes |
| Input | |||||
| Predictive Text Entry | Yes | n/a | n/a | Yes | Yes |
| Side Keys | Yes | Yes | Yes | Yes | Yes |
| Touch Screen | - |
Yes Capacitive |
Yes Capacitive |
- | - |
| Memory | |||||
| Memory Card Slot | - | - | Yes | Yes | - |
| Messaging | |||||
| Email Client | - | n/a | n/a | Yes | - |
| EMS / Picture Messaging | Yes | n/a | n/a | - | - |
| Instant Messaging | - | n/a | n/a | Yes | - |
| MMS | - | n/a | n/a | Yes | - |
| Text Messaging Templates | - | n/a | n/a | Yes | Yes |
| Music | |||||
| Headphone Jack (3.5mm) | - | - | Yes | - | - |
| Music Player | - | n/a | n/a | Yes | Yes |
| Stereo Speakers | - | Yes | - | - | - |
| Photo & Video | |||||
| TV Output | - | Yes | - | - | - |
| Power | |||||
| Fast Charging | - | Yes | Yes | - | - |
| Wireless Charging | - | Yes | - | - | - |
| Productivity | |||||
| Alarm | Yes | n/a | n/a | Yes | Yes |
| Calculator | Yes | n/a | n/a | Yes | Yes |
| Calendar | Yes | n/a | n/a | Yes | Yes |
| To-Do List | - | n/a | n/a | Yes | Yes |
| Voice Memo | - | n/a | n/a | Yes | Yes |
| Software | |||||
| Games | - | n/a | n/a | Yes | Yes |
| Java (J2ME) | - | n/a | n/a | Yes | Yes |
| Voice | |||||
| HD Voice | - | Yes | - | - | - |
| Headset Jack (2.5 mm) | Yes | n/a | n/a | - | Yes |
| Speaker Phone | Yes | Yes | Yes | Yes | Yes |
| Samsung Knack U310 | Samsung Galaxy S21 | ZTE Blade Max 3 / Max Blue | Samsung SGH-A727 | Samsung MM-A900 / SPH-A900 / Ace | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung Knack U310 | Samsung Galaxy S21 | ZTE Blade Max 3 / Max Blue | Samsung SGH-A727 | Samsung MM-A900 / SPH-A900 / Ace |
