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| Phone | Samsung Galaxy A21 | Sony Ericsson Z550a | Cricket Debut S2 / AT&T Calypso 4 | Siemens CT66 / C66 / C65 / C71 / C70 |
| Current U.S. Carriers | (none) | (none) | AT&T | (none) |
| Global Availability | Released | Released | Released | Released |
| Specifications | ||||
|---|---|---|---|---|
| Display Size |
6.5" diag. 20 : 9 |
1.9" diag. 4 : 3 |
6.1" diag. 19.5 : 9 |
? |
| Display Resolution & Type |
720 x 1600 pixels (~270 ppi) LCD (TFT/TFD) |
176 x 220 pixels (~148 ppi) LCD (TFT/TFD) |
720 x 1560 pixels (~282 ppi) LCD (TFT/TFD) |
130 x 130 pixels LCD (Color) |
| Display Refresh | 60 Hz | ? | 60 Hz | ? |
| Battery | 4,000 mAh | ? | 3,000 mAh | 600 mAh |
| Processor | 2 GHz MediaTek Helio P35 (MT6765) | ? | 2 GHz MediaTek Helio A22 (MT6761WB) | ? |
| RAM | 3 GB | ? | 3 GB | ? |
| Storage | 32 GB | ? raw hardware | 64 GB | ? raw hardware |
| Main Camera | 16 megapixel | 1 megapixel | 8 megapixel | Yes |
| Wide Camera | 8 megapixel | - | - | - |
| Tele Camera | - | - | - | - |
| Video Capture | 1080p HD | ? | ? | - |
| Front Camera | 13 megapixel | - | 5 megapixel | - |
| Weight |
6.81 oz (193g) |
3.26 oz (92g) |
5.64 oz (160g) |
3 oz (85g) |
| Dimensions |
6.61" x 3.02" x 0.32" (168 x 77 x 8.1 mm) |
3.43" x 1.77" x 0.79" (87 x 45 x 20.1 mm) |
6.11" x 2.87" x 0.34" (155 x 73 x 8.6 mm) |
4.1" x 1.8" x 0.7" (104 x 46 x 17.8 mm) |
| Form Factor | Slab | Clamshell | Slab | Slab |
| Platform / OS | Android | (proprietary) | Android | (proprietary) |
| Network Bands |
4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 20, 25, 26, 28, 38, 39, 40, 41, 66, 71 WCDMA: 1, 2, 4, 5, 8 CDMA: 800, 850, 1900 GSM: 850, 900, 1800, 1900 |
GSM: 850, 900, 1800, 1900 |
4G LTE: 2, 3, 4, 5, 7, 12, 14, 20, 30, 66 WCDMA: 1, 2, 4, 5, 8 |
GSM: 850, 1800, 1900 |
| Data Technology | LTE (Cat 6) | GPRS | LTE (Cat 4) | GPRS |
| Features | ||||
| Fingerprint Reader |
Yes stand-alone |
- | - | - |
| Flashlight | Yes | - | Yes | - |
| Accessibility | ||||
| Hearing Aid Compatible |
Yes M4, T3 (mostly tele-coil compatible) |
- |
Yes M4, T4 (very tele-coil compatible) |
- |
| Multiple Languages | n/a | Yes | n/a | Yes |
| TTY/TDD (Digital) | Yes | Yes | - | - |
| Alerts | ||||
| Extra Display | - | Yes | - | - |
| Ringer Profiles | - | Yes | - | Yes |
| Connectivity | ||||
| Bluetooth | Yes | Yes | Yes | - |
| Infrared (IR) | - | - | - | Yes |
| NFC | Yes | - | - | - |
| USB |
Yes USB Type C |
Yes |
Yes USB Type C |
Yes |
| Wi-Fi |
Yes 5 (802.11 a,ac,b,g,n) |
- |
Yes 5 (802.11 a,ac,b,g,n) |
- |
| Contacts | ||||
| Picture ID | n/a | Yes | n/a | Yes |
| Ringer ID | n/a | Yes | n/a | Yes |
| Voice Dialing | n/a | Yes | n/a | - |
| Customization | ||||
| Changeable Body Plates | - | - | - | Yes |
| Custom Graphics | n/a | Yes | n/a | Yes |
| Custom Ringtones | n/a | Yes | n/a | Yes |
| Real-Music Ringers | n/a | Yes | n/a | - |
| Data & Network | ||||
| Data Tethering | n/a | Yes | n/a | - |
| WAP / Web Browser | n/a | Yes | n/a | Yes |
| Input | ||||
| Predictive Text Entry | n/a | Yes | n/a | Yes |
| Side Keys | Yes | Yes | Yes | - |
| Touch Screen |
Yes Capacitive |
- |
Yes Capacitive |
- |
| Memory | ||||
| Memory Card Slot | Yes | Yes | Yes | - |
| Messaging | ||||
| Email Client | n/a | Yes | n/a | - |
| EMS / Picture Messaging | n/a | - | n/a | Yes |
| MMS | n/a | Yes | n/a | Yes |
| Text Messaging Templates | n/a | Yes | n/a | Yes |
| Music | ||||
| FM Radio | - | Yes | - | - |
| Headphone Jack (3.5mm) | Yes | - | Yes | - |
| Music Player | n/a | Yes | n/a | - |
| Power | ||||
| Fast Charging | Yes | - | Yes | - |
| Productivity | ||||
| Alarm | n/a | Yes | n/a | Yes |
| Calculator | n/a | Yes | n/a | Yes |
| Calendar | n/a | Yes | n/a | Yes |
| To-Do List | n/a | Yes | n/a | Yes |
| Voice Memo | n/a | Yes | n/a | Yes |
| Software | ||||
| Games | n/a | Yes | n/a | Yes |
| Java (J2ME) | n/a | Yes | n/a | Yes |
| Voice | ||||
| Call Screening | - | - | - | Yes |
| HD Voice | Yes | - | Yes | - |
| Push-To-Talk | - | Yes * | - | Yes * |
| Speaker Phone | Yes | Yes | Yes | Yes |
| * Some versions only | ||||
| Samsung Galaxy A21 | Sony Ericsson Z550a | Cricket Debut S2 / AT&T Calypso 4 | Siemens CT66 / C66 / C65 / C71 / C70 | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung Galaxy A21 | Sony Ericsson Z550a | Cricket Debut S2 / AT&T Calypso 4 | Siemens CT66 / C66 / C65 / C71 / C70 |
