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| Phone | ZTE Z431 / Altair | LG Optimus F6 | Samsung SGH-A717 | Samsung Galaxy S21 | Samsung Galaxy S21 FE 5G |
| Current U.S. Carriers | (none) | (none) | (none) | Verizon | Verizon |
| Global Availability | Released | Released | Released | Released | Released |
| Specifications | |||||
|---|---|---|---|---|---|
| Display Size |
2.4" diag. 4 : 3 |
4.5" diag. 16 : 9 |
? |
6.2" diag. 20 : 9 |
6.4" diag. 19.5 : 9 |
| Display Resolution & Type |
320 x 240 pixels (~167 ppi) LCD (TFT/TFD) |
540 x 960 pixels (~245 ppi) LCD (TFT/TFD) |
240 x 320 pixels LCD (TFT/TFD) |
1080 x 2400 pixels (~424 ppi) AMOLED |
1080 x 2340 pixels (~403 ppi) AMOLED |
| Display Refresh | ? | 60 Hz | ? | 120 Hz | 120 Hz |
| Battery | 1,000 mAh | 2,460 mAh | ? | 4,000 mAh | 4,500 mAh |
| Processor | ? | 1.2 GHz Qualcomm Snapdragon 400 MSM8930 | ? | 2.8 GHz Qualcomm Snapdragon 888 | Qualcomm Snapdragon 888 |
| RAM | ? | 1 GB | ? | 8 GB | 6 GB * |
| Storage | ? raw hardware | 4 GB | ? raw hardware | 128 GB * | 128 GB * |
| Main Camera | 2 megapixel | 5 megapixel | 2 megapixel | 12 megapixel | 12 megapixel |
| Wide Camera | - | - | - | 12 megapixel | 12 megapixel |
| Tele Camera | - | - | - | 64 megapixel | 8 megapixel |
| Video Capture | QVGA (320 x 240) | 1080p HD | QCIF (176 x 144) | 8K | 4K UHD |
| Front Camera | - | 1 megapixel | - | 10 megapixel | 32 megapixel |
| Weight |
3.52 oz (100g) |
4.5 oz (128g) |
3.31 oz (94g) |
6.03 oz (171g) |
6.24 oz (177g) |
| Dimensions |
4.49" x 2.39" x 0.41" (114 x 61 x 10.4 mm) |
5.04" x 2.59" x 0.4" (128 x 66 x 10.2 mm) |
4.07" x 2.15" x 0.55" (103 x 55 x 14 mm) |
5.97" x 2.8" x 0.31" (152 x 71 x 7.9 mm) |
6.13" x 2.93" x 0.31" (156 x 75 x 7.9 mm) |
| Form Factor | Slab | Slab | Clamshell | Slab | Slab |
| Platform / OS | (proprietary) | Android | (proprietary) | Android | Android |
| Network Bands |
WCDMA: 1, 2, 5 GSM: 850, 900, 1800, 1900 |
4G LTE: 2, 4, 17 WCDMA: 1, 2, 4, 5 GSM: 850, 900, 1800, 1900 |
WCDMA: 2, 5 GSM: 850, 900, 1800, 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 |
5G: 2, 5, 12, 25, 30, 41, 66, 71, 77-C, 260, 261 4G LTE: 2, 4, 5, 7, 12, 13, 14, 25, 26, 29, 30, 38, 41, 48, 66, 71 WCDMA: 2, 4, 5 CDMA: 800, 850, 1900 GSM: 850, 900, 1800, 1900 |
| Data Technology | ? | LTE (Cat 3) | HSDPA 1.8 | NR (5G) | NR (5G) |
| Features | |||||
| Barometer | - | - | - | Yes | Yes |
| Fingerprint Reader | - | - | - |
Yes in-display (ultrasonic) |
Yes in-display (optical) |
| Flashlight | - | - | - | Yes | Yes |
| GPS / Location | Yes | n/a | - | n/a | n/a |
| Water-Resistant | - | - | - |
Yes IPX8 (SCUBA) |
Yes IPX8 (SCUBA) |
| Accessibility | |||||
| Adjustable Text Size | - | n/a | - | n/a | n/a |
| Hearing Aid Compatible |
Yes M3, T3 (mostly tele-coil compatible) |
Yes M3, T4 (very tele-coil compatible) |
Yes M3 (mostly compatible) |
Yes M3, T3 (mostly tele-coil compatible) |
Yes M3, T3 (mostly tele-coil compatible) |
| Multiple Languages | Yes | n/a | Yes | n/a | n/a |
| TTY/TDD (Digital) | Yes | Yes | Yes | Yes | Yes |
| Alerts | |||||
| Extra Display | - | - | Yes | - | - |
| Ringer Profiles | Yes | - | Yes | - | - |
| Connectivity | |||||
| Bluetooth | Yes | Yes | Yes | Yes | Yes |
| Infrared (IR) | - | Yes | - | - | - |
| Mobile Hotspot | - | n/a | - | n/a | n/a |
| NFC | - | Yes | - | Yes | Yes |
| USB |
Yes Micro-USB |
Yes Micro-USB |
Yes |
Yes USB Type C |
Yes USB Type C |
| Wi-Fi | - |
Yes 4 (802.11 a,b,g,n) |
- |
Yes 6 (802.11 a,ac,ax,b,g,n) |
Yes 6 (802.11 a,ac,ax,b,g,n) |
| Contacts | |||||
| Picture ID | Yes | n/a | Yes | n/a | n/a |
| Ringer ID | Yes | n/a | Yes | n/a | n/a |
| Voice Dialing | - | n/a | - | n/a | n/a |
| Customization | |||||
| Custom Graphics | Yes | n/a | Yes | n/a | n/a |
| Custom Ringtones | Yes | n/a | Yes | n/a | n/a |
| Real-Music Ringers | Yes | n/a | Yes | n/a | n/a |
| Data & Network | |||||
| Data Tethering | Yes | n/a | Yes | n/a | n/a |
| WAP / Web Browser | Yes | n/a | Yes | n/a | n/a |
| Input | |||||
| Predictive Text Entry | Yes | n/a | Yes | n/a | n/a |
| Side Keys | Yes | Yes | Yes | Yes | Yes |
| Text Keyboard, Hardware | Yes | - | - | - | - |
| Touch Screen | - |
Yes Capacitive |
- |
Yes Capacitive |
Yes Capacitive |
| Memory | |||||
| Memory Card Slot | Yes | Yes | Yes | - | - |
| Messaging | |||||
| Email Client | Yes | n/a | Yes | n/a | n/a |
| Instant Messaging | - | n/a | Yes | n/a | n/a |
| MMS | Yes | n/a | Yes | n/a | n/a |
| Text Messaging Templates | Yes | n/a | Yes | n/a | n/a |
| Music | |||||
| Headphone Jack (3.5mm) | Yes | Yes | - | - | - |
| Music Player | Yes | n/a | Yes | n/a | n/a |
| Stereo Speakers | - | - | - | Yes | Yes |
| Photo & Video | |||||
| DLNA | - | Yes | - | - | - |
| TV Output | - | - | - | Yes | Yes |
| Power | |||||
| Fast Charging | - | - | - | Yes | Yes |
| Wireless Charging | - | - | - | Yes | Yes |
| Productivity | |||||
| Alarm | Yes | n/a | Yes | n/a | n/a |
| Calculator | Yes | n/a | Yes | n/a | n/a |
| Calendar | Yes | n/a | Yes | n/a | n/a |
| To-Do List | - | n/a | Yes | n/a | n/a |
| Voice Memo | Yes | n/a | Yes | n/a | n/a |
| Software | |||||
| BREW | Yes | n/a | - | n/a | n/a |
| Games | Yes | n/a | Yes | n/a | n/a |
| Java (J2ME) | - | n/a | Yes | n/a | n/a |
| Voice | |||||
| HD Voice | - | - | - | Yes | Yes |
| Speaker Phone | Yes | Yes | Yes | Yes | Yes |
| ZTE Z431 / Altair | LG Optimus F6 | Samsung SGH-A717 | Samsung Galaxy S21 | Samsung Galaxy S21 FE 5G | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | ZTE Z431 / Altair | LG Optimus F6 | Samsung SGH-A717 | Samsung Galaxy S21 | Samsung Galaxy S21 FE 5G |
